diff --git a/internal/cloud/web-performance.test.ts b/internal/cloud/web-performance.test.ts
index 49cacf52..f31f4c0a 100644
--- a/internal/cloud/web-performance.test.ts
+++ b/internal/cloud/web-performance.test.ts
@@ -386,6 +386,17 @@ test("Workbench UI OTel spans include timeout activity diagnostics without raw t
         activityWaitingFor: "code-agent",
         activityLastEventLabel: "realtime:heartbeat",
         activityIdleMs: 13042,
+        eventCount: 1,
+        contractVersion: "workbench-sync-v1",
+        realtimeAuthority: "workbench-realtime-authority-v2",
+        sinceOutboxSeq: 7,
+        syncCursorOutboxSeq: 12,
+        entityFamilyCount: 1,
+        entityFamilies: "turn",
+        maxEntityVersion: 3,
+        projectionRevision: "rev_sync",
+        terminalSeal: true,
+        detailProjection: false,
         traceId: "trc_secret"
       }]
     } as Record<string, unknown>, { OTEL_EXPORTER_OTLP_TRACES_ENDPOINT: "http://otel.example/v1/traces" });
@@ -393,12 +404,23 @@ test("Workbench UI OTel spans include timeout activity diagnostics without raw t
     assert.equal(result.submitted, 1);
     assert.equal(calls.length, 1);
     const span = calls[0].resourceSpans[0].scopeSpans[0].spans[0];
-    const attrs = Object.fromEntries(span.attributes.map((item) => [item.key, item.value.stringValue ?? Number(item.value.intValue) ?? item.value.boolValue]));
+    const attrs = Object.fromEntries(span.attributes.map((item) => [item.key, item.value.stringValue ?? (item.value.intValue !== undefined ? Number(item.value.intValue) : item.value.boolValue)]));
     assert.equal(attrs["http.route"], "/v1/workbench/turns/:id");
     assert.equal(attrs["workbench.ui.timeout_name"], "workbench turn");
     assert.equal(attrs["workbench.ui.activity_waiting_for"], "code-agent");
     assert.equal(attrs["workbench.ui.activity_last_event_label"], "realtime:heartbeat");
     assert.equal(attrs["workbench.ui.activity_idle_ms"], 13042);
+    assert.equal(attrs["workbench.sync.event_count"], 1);
+    assert.equal(attrs["workbench.sync.contract_version"], "workbench-sync-v1");
+    assert.equal(attrs["workbench.realtime.authority"], "workbench-realtime-authority-v2");
+    assert.equal(attrs["workbench.sync.since_outbox_seq"], 7);
+    assert.equal(attrs["workbench.sync.cursor_outbox_seq"], 12);
+    assert.equal(attrs["workbench.sync.entity_family_count"], 1);
+    assert.equal(attrs["workbench.sync.entity_families"], "turn");
+    assert.equal(attrs["workbench.sync.max_entity_version"], 3);
+    assert.equal(attrs["workbench.projection.revision"], "rev_sync");
+    assert.equal(attrs["workbench.terminal.seal"], true);
+    assert.equal(attrs["workbench.detail.projection"], false);
     assert.doesNotMatch(JSON.stringify(calls[0]), /trc_secret|ses_secret|prompt|api key/iu);
   } finally {
     globalThis.fetch = originalFetch;
diff --git a/internal/cloud/web-performance.ts b/internal/cloud/web-performance.ts
index 63871aa1..3a4ae606 100644
--- a/internal/cloud/web-performance.ts
+++ b/internal/cloud/web-performance.ts
@@ -126,6 +126,17 @@ interface WebPerformanceEvent {
   resourceDecodedBodySize?: unknown;
   resourceNextHopProtocol?: unknown;
   resourceServerTiming?: unknown;
+  eventCount?: unknown;
+  contractVersion?: unknown;
+  realtimeAuthority?: unknown;
+  sinceOutboxSeq?: unknown;
+  syncCursorOutboxSeq?: unknown;
+  entityFamilyCount?: unknown;
+  entityFamilies?: unknown;
+  maxEntityVersion?: unknown;
+  projectionRevision?: unknown;
+  terminalSeal?: unknown;
+  detailProjection?: unknown;
 }
 
 interface NormalizedPerformanceEvent {
@@ -839,6 +850,15 @@ function normalizeWorkbenchUiOtelSpan(rawEvent: unknown, payload: WebPerformance
   const resourceDecodedBodySize = Math.min(Math.max(finiteNumber(input.resourceDecodedBodySize, NaN), 0), 100 * 1024 * 1024);
   const resourceNextHopProtocol = sanitizeOtelAttribute(input.resourceNextHopProtocol, 40);
   const resourceServerTiming = sanitizeOtelAttribute(input.resourceServerTiming, 240);
+  const eventCount = Math.min(Math.max(finiteNumber(input.eventCount, NaN), 0), 100_000);
+  const contractVersion = sanitizeOtelAttribute(input.contractVersion, 80);
+  const realtimeAuthority = sanitizeOtelAttribute(input.realtimeAuthority, 120);
+  const entityFamilies = sanitizeOtelAttribute(input.entityFamilies, 180);
+  const projectionRevision = sanitizeOtelAttribute(input.projectionRevision, 120);
+  const sinceOutboxSeq = Math.min(Math.max(finiteNumber(input.sinceOutboxSeq, NaN), 0), Number.MAX_SAFE_INTEGER);
+  const syncCursorOutboxSeq = Math.min(Math.max(finiteNumber(input.syncCursorOutboxSeq, NaN), 0), Number.MAX_SAFE_INTEGER);
+  const entityFamilyCount = Math.min(Math.max(finiteNumber(input.entityFamilyCount, NaN), 0), 1000);
+  const maxEntityVersion = Math.min(Math.max(finiteNumber(input.maxEntityVersion, NaN), 0), Number.MAX_SAFE_INTEGER);
   return {
     name: ["workbench", eventType, scope, state].filter((part) => part && part !== "unknown").join("."),
     uiTraceId,
@@ -874,6 +894,17 @@ function normalizeWorkbenchUiOtelSpan(rawEvent: unknown, payload: WebPerformance
       ...(Number.isFinite(resourceDecodedBodySize) ? { "workbench.ui.resource_decoded_body_size": Math.trunc(resourceDecodedBodySize) } : {}),
       ...(resourceNextHopProtocol ? { "workbench.ui.resource_next_hop_protocol": resourceNextHopProtocol } : {}),
       ...(resourceServerTiming ? { "workbench.ui.resource_server_timing": resourceServerTiming } : {}),
+      ...(Number.isFinite(eventCount) ? { "workbench.sync.event_count": Math.trunc(eventCount) } : {}),
+      ...(contractVersion ? { "workbench.sync.contract_version": contractVersion } : {}),
+      ...(realtimeAuthority ? { "workbench.realtime.authority": realtimeAuthority } : {}),
+      ...(Number.isFinite(sinceOutboxSeq) ? { "workbench.sync.since_outbox_seq": Math.trunc(sinceOutboxSeq) } : {}),
+      ...(Number.isFinite(syncCursorOutboxSeq) ? { "workbench.sync.cursor_outbox_seq": Math.trunc(syncCursorOutboxSeq) } : {}),
+      ...(Number.isFinite(entityFamilyCount) ? { "workbench.sync.entity_family_count": Math.trunc(entityFamilyCount) } : {}),
+      ...(entityFamilies ? { "workbench.sync.entity_families": entityFamilies } : {}),
+      ...(Number.isFinite(maxEntityVersion) ? { "workbench.sync.max_entity_version": Math.trunc(maxEntityVersion) } : {}),
+      ...(projectionRevision ? { "workbench.projection.revision": projectionRevision } : {}),
+      ...(typeof input.terminalSeal === "boolean" ? { "workbench.terminal.seal": input.terminalSeal } : {}),
+      ...(typeof input.detailProjection === "boolean" ? { "workbench.detail.projection": input.detailProjection } : {}),
       "workbench.ui.values_printed": false,
       "http.route": route,
       "http.request.method": normalizeMethod(input.method),
diff --git a/web/hwlab-cloud-web/src/stores/workbench-colada-keys.ts b/web/hwlab-cloud-web/src/stores/workbench-colada-keys.ts
index a24cbf15..a6f75444 100644
--- a/web/hwlab-cloud-web/src/stores/workbench-colada-keys.ts
+++ b/web/hwlab-cloud-web/src/stores/workbench-colada-keys.ts
@@ -1,5 +1,5 @@
-// SPEC: pikasTech/HWLAB#2345 Workbench Pinia Colada migration.
-// Responsibility: Stable Workbench query and mutation keys for Pinia Colada cache authority.
+// SPEC: pikasTech/HWLAB#2345 Workbench Pinia Colada migration; PJ2026-010401080313 Workbench实时权威 draft-2026-07-08-p0-workbench-realtime-authority-v2.
+// Responsibility: Stable Workbench semantic query and mutation keys for Pinia Colada cache authority.
 
 import type { EntryKey } from "@pinia/colada";
 
@@ -19,19 +19,40 @@ export interface WorkbenchTraceEventsKeyInput {
   limit?: number | null;
 }
 
+export interface WorkbenchSyncReplayKeyInput {
+  sessionId?: string | null;
+  traceId?: string | null;
+  since?: number | null;
+}
+
 export const workbenchColadaKeys = {
   root: (): EntryKey => ["workbench"],
-  serverState: (): EntryKey => ["workbench", "server-state"],
-  sessionsRoot: (): EntryKey => ["workbench", "sessions"],
-  sessions: (input: WorkbenchSessionsKeyInput = {}): EntryKey => ["workbench", "sessions", normalizeKeyObject({ includeSessionId: input.includeSessionId ?? null, cursor: input.cursor ?? null, limit: finiteNumber(input.limit) })],
-  sessionRoot: (): EntryKey => ["workbench", "session"],
-  session: (sessionId: string): EntryKey => ["workbench", "session", sessionId],
-  sessionMessagesRoot: (): EntryKey => ["workbench", "session-messages"],
-  sessionMessages: (sessionId: string, input: WorkbenchSessionMessagesKeyInput = {}): EntryKey => ["workbench", "session-messages", sessionId, normalizeKeyObject({ cursor: input.cursor ?? null, limit: finiteNumber(input.limit) })],
-  turnRoot: (): EntryKey => ["workbench", "turn"],
-  turn: (traceId: string): EntryKey => ["workbench", "turn", traceId],
-  traceEventsRoot: (): EntryKey => ["workbench", "trace-events"],
-  traceEvents: (traceId: string, input: WorkbenchTraceEventsKeyInput = {}): EntryKey => ["workbench", "trace-events", traceId, normalizeKeyObject({ afterProjectedSeq: finiteNumber(input.afterProjectedSeq), limit: finiteNumber(input.limit) })],
+  serverState: (): EntryKey => ["workbench", "projection", "server-state"],
+  snapshotRoot: (): EntryKey => ["workbench", "snapshot"],
+  snapshotSessionsRoot: (): EntryKey => ["workbench", "snapshot", "sessions"],
+  snapshotSessions: (input: WorkbenchSessionsKeyInput = {}): EntryKey => ["workbench", "snapshot", "sessions", normalizeKeyObject({ includeSessionId: input.includeSessionId ?? null, cursor: input.cursor ?? null, limit: finiteNumber(input.limit) })],
+  snapshotSessionRoot: (): EntryKey => ["workbench", "snapshot", "session"],
+  snapshotSession: (sessionId: string): EntryKey => ["workbench", "snapshot", "session", sessionId],
+  syncRoot: (): EntryKey => ["workbench", "sync"],
+  syncReplay: (input: WorkbenchSyncReplayKeyInput = {}): EntryKey => ["workbench", "sync", "replay", normalizeKeyObject({ sessionId: input.sessionId ?? null, traceId: input.traceId ?? null, since: finiteNumber(input.since) })],
+  historyRoot: (): EntryKey => ["workbench", "history"],
+  historySessionMessagesRoot: (): EntryKey => ["workbench", "history", "session-messages"],
+  historySessionMessages: (sessionId: string, input: WorkbenchSessionMessagesKeyInput = {}): EntryKey => ["workbench", "history", "session-messages", sessionId, normalizeKeyObject({ cursor: input.cursor ?? null, limit: finiteNumber(input.limit) })],
+  detailRoot: (): EntryKey => ["workbench", "detail"],
+  detailTurnRoot: (): EntryKey => ["workbench", "detail", "turn"],
+  detailTurn: (traceId: string): EntryKey => ["workbench", "detail", "turn", traceId],
+  detailTraceEventsRoot: (): EntryKey => ["workbench", "detail", "trace-events"],
+  detailTraceEvents: (traceId: string, input: WorkbenchTraceEventsKeyInput = {}): EntryKey => ["workbench", "detail", "trace-events", traceId, normalizeKeyObject({ afterProjectedSeq: finiteNumber(input.afterProjectedSeq), limit: finiteNumber(input.limit) })],
+  sessionsRoot: (): EntryKey => workbenchColadaKeys.snapshotSessionsRoot(),
+  sessions: (input: WorkbenchSessionsKeyInput = {}): EntryKey => workbenchColadaKeys.snapshotSessions(input),
+  sessionRoot: (): EntryKey => workbenchColadaKeys.snapshotSessionRoot(),
+  session: (sessionId: string): EntryKey => workbenchColadaKeys.snapshotSession(sessionId),
+  sessionMessagesRoot: (): EntryKey => workbenchColadaKeys.historySessionMessagesRoot(),
+  sessionMessages: (sessionId: string, input: WorkbenchSessionMessagesKeyInput = {}): EntryKey => workbenchColadaKeys.historySessionMessages(sessionId, input),
+  turnRoot: (): EntryKey => workbenchColadaKeys.detailTurnRoot(),
+  turn: (traceId: string): EntryKey => workbenchColadaKeys.detailTurn(traceId),
+  traceEventsRoot: (): EntryKey => workbenchColadaKeys.detailTraceEventsRoot(),
+  traceEvents: (traceId: string, input: WorkbenchTraceEventsKeyInput = {}): EntryKey => workbenchColadaKeys.detailTraceEvents(traceId, input),
   providerProfiles: (): EntryKey => ["workbench", "provider-profiles"],
   mutationSubmit: (): EntryKey => ["workbench", "submit"],
   mutationSteer: (): EntryKey => ["workbench", "steer"],
diff --git a/web/hwlab-cloud-web/src/stores/workbench-colada-mutations.ts b/web/hwlab-cloud-web/src/stores/workbench-colada-mutations.ts
index 356185a4..5ee2ce9d 100644
--- a/web/hwlab-cloud-web/src/stores/workbench-colada-mutations.ts
+++ b/web/hwlab-cloud-web/src/stores/workbench-colada-mutations.ts
@@ -1,5 +1,5 @@
-// SPEC: pikasTech/HWLAB#2345 Workbench Pinia Colada migration.
-// Responsibility: Colada-governed Workbench mutation execution and query invalidation.
+// SPEC: pikasTech/HWLAB#2345 Workbench Pinia Colada migration; PJ2026-010401080313 Workbench实时权威 draft-2026-07-08-p0-workbench-realtime-authority-v2.
+// Responsibility: Colada-governed Workbench mutation execution and semantic query invalidation.
 
 import { useMutation, useQueryCache } from "@pinia/colada";
 import { api } from "@/api";
@@ -35,7 +35,7 @@ export function useWorkbenchColadaMutations(): WorkbenchColadaMutations {
   const createSessionMutation = useMutation<ApiResult<{ session?: Record<string, unknown> }>, Record<string, unknown> | undefined>({
     key: workbenchColadaKeys.mutationCreateSession(),
     mutation: (payload) => api.agent.createAgentSession(payload ?? {}),
-    onSettled: () => { void queryCache.invalidateQueries({ key: workbenchColadaKeys.sessionsRoot() }); }
+    onSettled: () => { void queryCache.invalidateQueries({ key: workbenchColadaKeys.snapshotRoot() }); }
   });
   const submitMutation = useMutation<ApiResult<AgentChatResponse>, WorkbenchAgentMutationInput>({
     key: workbenchColadaKeys.mutationSubmit(),
@@ -69,10 +69,9 @@ export function useWorkbenchColadaMutations(): WorkbenchColadaMutations {
 
 async function invalidateMutationScope(queryCache: ReturnType<typeof useQueryCache>, sessionId: string | null | undefined, traceId: string | null | undefined): Promise<void> {
   await Promise.all([
-    queryCache.invalidateQueries({ key: workbenchColadaKeys.sessionsRoot() }),
-    sessionId ? queryCache.invalidateQueries({ key: workbenchColadaKeys.session(sessionId) }) : Promise.resolve(),
-    sessionId ? queryCache.invalidateQueries({ key: workbenchColadaKeys.sessionMessagesRoot().concat(sessionId) }) : Promise.resolve(),
-    traceId ? queryCache.invalidateQueries({ key: workbenchColadaKeys.turn(traceId) }) : Promise.resolve(),
-    traceId ? queryCache.invalidateQueries({ key: workbenchColadaKeys.traceEventsRoot().concat(traceId) }) : Promise.resolve()
+    queryCache.invalidateQueries({ key: workbenchColadaKeys.syncRoot() }),
+    queryCache.invalidateQueries({ key: workbenchColadaKeys.snapshotRoot() }),
+    sessionId ? queryCache.invalidateQueries({ key: workbenchColadaKeys.historySessionMessagesRoot().concat(sessionId) }) : Promise.resolve(),
+    traceId ? queryCache.invalidateQueries({ key: workbenchColadaKeys.detailRoot() }) : Promise.resolve()
   ]);
 }
diff --git a/web/hwlab-cloud-web/src/stores/workbench-colada-queries.ts b/web/hwlab-cloud-web/src/stores/workbench-colada-queries.ts
index 4aec2256..a00e56b2 100644
--- a/web/hwlab-cloud-web/src/stores/workbench-colada-queries.ts
+++ b/web/hwlab-cloud-web/src/stores/workbench-colada-queries.ts
@@ -1,9 +1,10 @@
-// SPEC: pikasTech/HWLAB#2345 Workbench Pinia Colada migration.
-// Responsibility: Colada-governed Workbench read-model query execution, cache keys, invalidation and refetch.
+// SPEC: pikasTech/HWLAB#2345 Workbench Pinia Colada migration; PJ2026-010401080313 Workbench实时权威 draft-2026-07-08-p0-workbench-realtime-authority-v2.
+// Responsibility: Colada-governed Workbench semantic query execution, cache keys, invalidation and refetch.
 
 import { useQueryCache, type EntryKey, type QueryCache } from "@pinia/colada";
 import { api } from "@/api";
 import type { ApiRequestOptions } from "@/api/client";
+import { fetchWorkbenchSyncReplay, type WorkbenchSyncReplayRequest, type WorkbenchSyncReplayResponse } from "@/api/workbench-events";
 import type { AgentChatResultResponse, ApiResult } from "@/types";
 import type { SessionListOptions, SessionMessageOptions, WorkbenchMessagePageResponse, WorkbenchSessionDetailResponse, WorkbenchSessionListResponse, WorkbenchTraceRequestOptions } from "@/api/workbench";
 import { workbenchColadaKeys } from "./workbench-colada-keys";
@@ -32,6 +33,7 @@ export interface WorkbenchColadaQueries {
   queryCache: QueryCache;
   fetchSessions: (options?: SessionListOptions & QueryRunOptions) => Promise<ApiResult<WorkbenchSessionListResponse>>;
   fetchSession: (sessionId: string, options?: WorkbenchSessionDetailQueryOptions) => Promise<ApiResult<WorkbenchSessionDetailResponse>>;
+  fetchSyncReplay: (input: WorkbenchSyncReplayRequest, options?: ApiRequestOptions & QueryRunOptions) => Promise<ApiResult<WorkbenchSyncReplayResponse>>;
   fetchSessionMessages: (sessionId: string, options?: SessionMessageOptions & QueryRunOptions) => Promise<ApiResult<WorkbenchMessagePageResponse>>;
   fetchTurn: (traceId: string, options?: WorkbenchTurnQueryOptions) => Promise<ApiResult<AgentChatResultResponse>>;
   fetchTraceEvents: (traceId: string, options?: WorkbenchTraceEventsQueryOptions) => Promise<ApiResult<AgentChatResultResponse>>;
@@ -51,6 +53,7 @@ export function useWorkbenchColadaQueries(): WorkbenchColadaQueries {
     queryCache,
     fetchSessions: (options = {}) => runWorkbenchQuery(queryCache, workbenchColadaKeys.sessions(options), () => api.workbench.sessions(options), options),
     fetchSession: (sessionId, options = {}) => runWorkbenchQuery(queryCache, workbenchColadaKeys.session(sessionId), () => api.workbench.session(sessionId, { timeoutMs: options.timeoutMs ?? null, includeMessages: false }), options),
+    fetchSyncReplay: (input, options = {}) => runWorkbenchQuery(queryCache, workbenchColadaKeys.syncReplay(input), () => fetchWorkbenchSyncReplay(input, options), options),
     fetchSessionMessages: (sessionId, options = {}) => runWorkbenchQuery(queryCache, workbenchColadaKeys.sessionMessages(sessionId, options), () => api.workbench.sessionMessages(sessionId, options), options),
     fetchTurn: (traceId, options = {}) => runWorkbenchQuery(queryCache, workbenchColadaKeys.turn(traceId), () => api.workbench.turn(traceId, options.timeoutMs ?? 8000, options.activityRef), options),
     fetchTraceEvents: (traceId, options = {}) => runWorkbenchQuery(queryCache, workbenchColadaKeys.traceEvents(traceId, options), () => api.workbench.traceEvents(traceId, options.timeoutMs ?? 8000, options.activityRef, { afterProjectedSeq: options.afterProjectedSeq, limit: options.limit }), options),
@@ -61,11 +64,10 @@ export function useWorkbenchColadaQueries(): WorkbenchColadaQueries {
     invalidateTurn: (traceId) => traceId ? queryCache.invalidateQueries({ key: workbenchColadaKeys.turn(traceId) }) : Promise.resolve(),
     invalidateTraceEvents: (traceId) => traceId ? queryCache.invalidateQueries({ key: workbenchColadaKeys.traceEventsRoot().concat(traceId) }) : Promise.resolve(),
     invalidateTraceScope: async (input) => Promise.all([
-      queryCache.invalidateQueries({ key: workbenchColadaKeys.sessionsRoot() }),
-      input.sessionId ? queryCache.invalidateQueries({ key: workbenchColadaKeys.session(input.sessionId) }) : Promise.resolve(),
-      input.sessionId ? queryCache.invalidateQueries({ key: workbenchColadaKeys.sessionMessagesRoot().concat(input.sessionId) }) : Promise.resolve(),
-      input.traceId ? queryCache.invalidateQueries({ key: workbenchColadaKeys.turn(input.traceId) }) : Promise.resolve(),
-      input.traceId ? queryCache.invalidateQueries({ key: workbenchColadaKeys.traceEventsRoot().concat(input.traceId) }) : Promise.resolve()
+      queryCache.invalidateQueries({ key: workbenchColadaKeys.syncRoot() }),
+      queryCache.invalidateQueries({ key: workbenchColadaKeys.snapshotRoot() }),
+      input.sessionId ? queryCache.invalidateQueries({ key: workbenchColadaKeys.historySessionMessagesRoot().concat(input.sessionId) }) : Promise.resolve(),
+      input.traceId ? queryCache.invalidateQueries({ key: workbenchColadaKeys.detailRoot() }) : Promise.resolve()
     ])
   };
 }
diff --git a/web/hwlab-cloud-web/src/stores/workbench-colada.test.ts b/web/hwlab-cloud-web/src/stores/workbench-colada.test.ts
index 8cf5f384..b886da60 100644
--- a/web/hwlab-cloud-web/src/stores/workbench-colada.test.ts
+++ b/web/hwlab-cloud-web/src/stores/workbench-colada.test.ts
@@ -10,6 +10,7 @@ import { PiniaColada, useQueryCache } from "@pinia/colada";
 import { createWorkbenchServerState, type WorkbenchServerState } from "./workbench-server-state";
 import { workbenchColadaKeys } from "./workbench-colada-keys";
 import { useWorkbenchColadaReducer } from "./workbench-colada-reducer";
+import { workbenchSyncReplayDiagnostic, workbenchSyncReplayEvents } from "./workbench-realtime-authority";
 
 const storeDir = path.dirname(fileURLToPath(import.meta.url));
 
@@ -23,9 +24,10 @@ function installColadaContext(): ReturnType<typeof createApp> {
 }
 
 test("workbench colada keys keep serializable hierarchical cache scopes", () => {
-  assert.deepEqual(workbenchColadaKeys.sessions({ limit: 50, includeSessionId: "ses_colada", cursor: "cur_2" }), ["workbench", "sessions", { cursor: "cur_2", includeSessionId: "ses_colada", limit: 50 }]);
-  assert.deepEqual(workbenchColadaKeys.sessionMessages("ses_colada", { limit: 20 }), ["workbench", "session-messages", "ses_colada", { cursor: null, limit: 20 }]);
-  assert.deepEqual(workbenchColadaKeys.traceEvents("trc_colada", { afterProjectedSeq: 4, limit: 25 }), ["workbench", "trace-events", "trc_colada", { afterProjectedSeq: 4, limit: 25 }]);
+  assert.deepEqual(workbenchColadaKeys.sessions({ limit: 50, includeSessionId: "ses_colada", cursor: "cur_2" }), ["workbench", "snapshot", "sessions", { cursor: "cur_2", includeSessionId: "ses_colada", limit: 50 }]);
+  assert.deepEqual(workbenchColadaKeys.syncReplay({ sessionId: "ses_colada", traceId: "trc_colada", since: 42 }), ["workbench", "sync", "replay", { sessionId: "ses_colada", since: 42, traceId: "trc_colada" }]);
+  assert.deepEqual(workbenchColadaKeys.sessionMessages("ses_colada", { limit: 20 }), ["workbench", "history", "session-messages", "ses_colada", { cursor: null, limit: 20 }]);
+  assert.deepEqual(workbenchColadaKeys.traceEvents("trc_colada", { afterProjectedSeq: 4, limit: 25 }), ["workbench", "detail", "trace-events", "trc_colada", { afterProjectedSeq: 4, limit: 25 }]);
 });
 
 test("workbench colada reducer stores projection state in the query cache", () => {
@@ -50,3 +52,53 @@ test("workbench colada read path preserves freshness governance", () => {
   assert.match(source, /const state = await queryCache\.refresh\(entry\);/u);
   assert.doesNotMatch(source, /queryCache\.fetch\(entry/u);
 });
+
+test("workbench colada sync replay is the only live repair query scope", () => {
+  const querySource = fs.readFileSync(path.join(storeDir, "workbench-colada-queries.ts"), "utf8");
+  const mutationSource = fs.readFileSync(path.join(storeDir, "workbench-colada-mutations.ts"), "utf8");
+  const storeSource = fs.readFileSync(path.join(storeDir, "workbench.ts"), "utf8");
+
+  assert.match(querySource, /fetchSyncReplay: \(input, options = \{\}\) => runWorkbenchQuery\(queryCache, workbenchColadaKeys\.syncReplay\(input\),/u);
+  assert.match(storeSource, /workbenchColadaQueries\.fetchSyncReplay\(\{ sessionId, traceId, since: sinceOutboxSeq \}/u);
+  assert.doesNotMatch(storeSource, /import \{ fetchWorkbenchSyncReplay \} from "@\/api\/workbench-events"/u);
+
+  assert.match(mutationSource, /workbenchColadaKeys\.syncRoot\(\)/u);
+  assert.match(mutationSource, /workbenchColadaKeys\.snapshotRoot\(\)/u);
+  assert.match(mutationSource, /workbenchColadaKeys\.historySessionMessagesRoot\(\)/u);
+  assert.match(mutationSource, /workbenchColadaKeys\.detailRoot\(\)/u);
+  assert.doesNotMatch(mutationSource, /workbenchColadaKeys\.traceEventsRoot\(\)\.concat/u);
+});
+
+test("workbench sync replay diagnostic exposes authority and terminal seal metadata", () => {
+  const payload = {
+    contractVersion: "workbench-sync-v1",
+    realtimeAuthority: "workbench-realtime-authority-v2",
+    cursor: { outboxSeq: 12 },
+    events: [{
+      type: "workbench.turn.snapshot",
+      realtimeAuthority: "workbench-realtime-authority-v2",
+      entity: { family: "turn", id: "trc_sync", version: 3, outboxSeq: 12, projectionRevision: "rev_sync" },
+      turn: { traceId: "trc_sync", status: "completed", terminal: true }
+    }]
+  };
+
+  const events = workbenchSyncReplayEvents(payload);
+  const diagnostic = workbenchSyncReplayDiagnostic(payload, events, { reason: "sse-gap", sinceOutboxSeq: 7 });
+
+  assert.deepEqual(diagnostic, {
+    code: "workbench_sync_replay_applied",
+    reason: "sse-gap",
+    eventCount: 1,
+    sinceOutboxSeq: 7,
+    syncCursorOutboxSeq: 12,
+    contractVersion: "workbench-sync-v1",
+    realtimeAuthority: "workbench-realtime-authority-v2",
+    entityFamilyCount: 1,
+    entityFamilies: "turn",
+    maxEntityVersion: 3,
+    projectionRevision: "rev_sync",
+    terminalSeal: true,
+    detailProjection: false,
+    valuesRedacted: true
+  });
+});
diff --git a/web/hwlab-cloud-web/src/stores/workbench-realtime-authority.ts b/web/hwlab-cloud-web/src/stores/workbench-realtime-authority.ts
index e68507f6..aaf0781a 100644
--- a/web/hwlab-cloud-web/src/stores/workbench-realtime-authority.ts
+++ b/web/hwlab-cloud-web/src/stores/workbench-realtime-authority.ts
@@ -96,6 +96,34 @@ export function workbenchSyncReplayEvents(payload: WorkbenchSyncReplayResponse |
   return output;
 }
 
+export function workbenchSyncReplayDiagnostic(payload: WorkbenchSyncReplayResponse | null | undefined, events: WorkbenchRealtimeEvent[], input: { reason: string; sinceOutboxSeq?: number | null }): Record<string, unknown> {
+  const eventRows = Array.isArray(events) ? events : [];
+  const cursor = recordValue(payload?.cursor);
+  const entities = eventRows.map(workbenchRealtimeEntityAuthority).filter((item): item is WorkbenchRealtimeEntityAuthority => item !== null);
+  const families = Array.from(new Set(entities.map((item) => item.family).filter(Boolean))).sort();
+  const versions = entities.map((item) => item.version).filter((value) => Number.isFinite(value));
+  const projectionRevision = firstString(
+    ...entities.map((item) => item.projectionRevision),
+    ...eventRows.map((event) => stringValue(event.projectionRevision ?? event.entity?.projectionRevision))
+  );
+  return {
+    code: "workbench_sync_replay_applied",
+    reason: input.reason,
+    eventCount: eventRows.length,
+    sinceOutboxSeq: finiteNumber(input.sinceOutboxSeq),
+    syncCursorOutboxSeq: finiteNumber(cursor?.outboxSeq ?? payload?.cursor?.outboxSeq),
+    contractVersion: stringValue(payload?.contractVersion),
+    realtimeAuthority: stringValue(payload?.realtimeAuthority),
+    entityFamilyCount: families.length,
+    entityFamilies: families.slice(0, 8).join(","),
+    maxEntityVersion: versions.length > 0 ? Math.max(...versions) : null,
+    projectionRevision,
+    terminalSeal: eventRows.some(workbenchRealtimeEventHasTerminalSeal),
+    detailProjection: eventRows.some((event) => workbenchRealtimeDetailOnly(event, workbenchRealtimeEntityAuthority(event))),
+    valuesRedacted: true
+  };
+}
+
 function authorityFailureCode(event: WorkbenchRealtimeEvent, entity: WorkbenchRealtimeEntityAuthority | null, detailProjection: boolean): string | null {
   if (detailProjection) return "workbench_realtime_detail_only_rejected";
   if (stringValue(event.realtimeAuthority) !== WORKBENCH_REALTIME_AUTHORITY_VERSION) return "workbench_realtime_authority_missing";
@@ -114,6 +142,35 @@ function syncEventKey(event: WorkbenchRealtimeEvent): string {
   return [event.type ?? "~", event.traceId ?? "~", event.sessionId ?? "~", event.cursor?.outboxSeq ?? event.outboxSeq ?? "~", event.cursor?.traceSeq ?? event.traceSeq ?? "~"].join("|");
 }
 
+function workbenchRealtimeEventHasTerminalSeal(event: WorkbenchRealtimeEvent): boolean {
+  const turn = recordValue(event.turn);
+  if (turn?.terminal === true) return true;
+  const message = recordValue(event.message);
+  const snapshot = recordValue(event.snapshot);
+  const traceEvent = recordValue(event.event);
+  return [
+    event.status,
+    turn?.status,
+    message?.status,
+    snapshot?.status,
+    traceEvent?.status,
+    traceEvent?.type,
+  ].some(isTerminalStatusText);
+}
+
+function isTerminalStatusText(value: unknown): boolean {
+  const text = String(value ?? "").trim().toLowerCase().replace(/_/gu, "-");
+  return /^(completed|complete|succeeded|success|failed|failure|error|canceled|cancelled|done|terminal|sealed|thread-resume-failed)$/u.test(text);
+}
+
+function firstString(...values: unknown[]): string | null {
+  for (const value of values) {
+    const text = stringValue(value);
+    if (text) return text;
+  }
+  return null;
+}
+
 function arrayOfRecords(value: unknown): Record<string, unknown>[] {
   return Array.isArray(value) ? value.filter((item): item is Record<string, unknown> => Boolean(recordValue(item))) : [];
 }
diff --git a/web/hwlab-cloud-web/src/stores/workbench.ts b/web/hwlab-cloud-web/src/stores/workbench.ts
index 1b9dfe41..d70f3ae9 100644
--- a/web/hwlab-cloud-web/src/stores/workbench.ts
+++ b/web/hwlab-cloud-web/src/stores/workbench.ts
@@ -4,7 +4,6 @@
 import { computed, nextTick, ref } from "vue";
 import { defineStore } from "pinia";
 import { api } from "@/api";
-import { fetchWorkbenchSyncReplay } from "@/api/workbench-events";
 import { workbenchRuntimePolicy } from "@/config/workbench-runtime-policy";
 import { createKeyedSingleflight } from "@/utils/scheduler/keyed-singleflight";
 import { createWorkbenchHealthProbeCache } from "@/utils/workbench-health";
@@ -68,7 +67,7 @@ import {
   traceSnapshotError
 } from "./workbench-message-projection-runtime";
 import { planWorkbenchRealtimeApply, planWorkbenchRealtimeRecovery, type WorkbenchRealtimeApplyStep, type WorkbenchRealtimeRecoveryStep } from "./workbench-realtime-plan";
-import { workbenchSyncReplayEvents } from "./workbench-realtime-authority";
+import { workbenchSyncReplayDiagnostic, workbenchSyncReplayEvents } from "./workbench-realtime-authority";
 import { useWorkbenchColadaMutations } from "./workbench-colada-mutations";
 import { useWorkbenchColadaQueries } from "./workbench-colada-queries";
 import { useWorkbenchColadaReducer } from "./workbench-colada-reducer";
@@ -1151,14 +1150,14 @@ export const useWorkbenchStore = defineStore("workbench", () => {
   }
 
   async function refreshWorkbenchSyncReplay(sessionId: string | null, traceId: string | null, sinceOutboxSeq: number | null, reason: string): Promise<void> {
-    const result = await fetchWorkbenchSyncReplay({ sessionId, traceId, since: sinceOutboxSeq }, { timeoutMs: 8000, activityRef: () => activityRef.value });
+    const result = await workbenchColadaQueries.fetchSyncReplay({ sessionId, traceId, since: sinceOutboxSeq }, { timeoutMs: 8000, activityRef: () => activityRef.value });
     if (!result.ok || !result.data) {
       recordWorkbenchRuntimeDiagnostic({ module: "workbench-sync-replay", sessionId, traceId, outcome: "network", diagnostic: { code: "workbench_sync_replay_failed", reason, status: result.status, apiError: result.apiError, valuesRedacted: true } });
       return;
     }
     const events = workbenchSyncReplayEvents(result.data);
     for (const event of events) applyRealtimeEvent(event, realtimeEventName(event));
-    recordWorkbenchRuntimeDiagnostic({ module: "workbench-sync-replay", sessionId, traceId, outcome: "ok", diagnostic: { code: "workbench_sync_replay_applied", reason, eventCount: events.length, sinceOutboxSeq, valuesRedacted: true } });
+    recordWorkbenchRuntimeDiagnostic({ module: "workbench-sync-replay", sessionId, traceId, outcome: "ok", diagnostic: workbenchSyncReplayDiagnostic(result.data, events, { reason, sinceOutboxSeq }) });
   }
 
   function scheduleActiveTraceRestGapFill(traceId: string | null | undefined, reason: string, delayMs = runtimePolicy.workbenchActiveTraceRestGapFillInitialMs): void {
diff --git a/web/hwlab-cloud-web/src/utils/workbench-performance.ts b/web/hwlab-cloud-web/src/utils/workbench-performance.ts
index 69d957ac..93ec3ce7 100644
--- a/web/hwlab-cloud-web/src/utils/workbench-performance.ts
+++ b/web/hwlab-cloud-web/src/utils/workbench-performance.ts
@@ -58,6 +58,16 @@ interface WorkbenchPerformanceEvent {
   diagnosticCode?: string;
   rootCause?: string;
   recoveryAction?: string;
+  contractVersion?: string;
+  realtimeAuthority?: string;
+  sinceOutboxSeq?: number;
+  syncCursorOutboxSeq?: number;
+  entityFamilyCount?: number;
+  entityFamilies?: string;
+  maxEntityVersion?: number;
+  projectionRevision?: string;
+  terminalSeal?: boolean;
+  detailProjection?: boolean;
   transportState?: string;
   scopedKey?: string;
   eventCount?: number;
@@ -379,6 +389,16 @@ export function recordWorkbenchRuntimeDiagnostic(input: { module?: string | null
     diagnosticCode: diagnosticLabel(code),
     rootCause: diagnosticText(diagnostic, "rootCause", "reason")?.slice(0, 160),
     recoveryAction: diagnosticText(diagnostic, "recoveryAction")?.slice(0, 160),
+    contractVersion: diagnosticLabel(diagnosticText(diagnostic, "contractVersion")),
+    realtimeAuthority: diagnosticLabel(diagnosticText(diagnostic, "realtimeAuthority", "authority")),
+    sinceOutboxSeq: diagnosticNumber(diagnostic, "sinceOutboxSeq"),
+    syncCursorOutboxSeq: diagnosticNumber(diagnostic, "syncCursorOutboxSeq", "cursorOutboxSeq"),
+    entityFamilyCount: diagnosticNumber(diagnostic, "entityFamilyCount"),
+    entityFamilies: diagnosticText(diagnostic, "entityFamilies")?.slice(0, 160),
+    maxEntityVersion: diagnosticNumber(diagnostic, "maxEntityVersion", "entityVersion"),
+    projectionRevision: diagnosticText(diagnostic, "projectionRevision")?.slice(0, 120),
+    terminalSeal: diagnosticBoolean(diagnostic, "terminalSeal"),
+    detailProjection: diagnosticBoolean(diagnostic, "detailProjection"),
     transportState: diagnosticLabel(diagnosticText(diagnostic, "transportState")),
     scopedKey: hashIdentifier(diagnosticText(diagnostic, "scopedKey"), "scope"),
     eventCount: diagnosticNumber(diagnostic, "eventCount"),
@@ -872,6 +892,20 @@ function diagnosticNumber(record: Record<string, unknown> | null, ...keys: strin
   return undefined;
 }
 
+function diagnosticBoolean(record: Record<string, unknown> | null, ...keys: string[]): boolean | undefined {
+  if (!record) return undefined;
+  for (const key of keys) {
+    const value = record[key];
+    if (typeof value === "boolean") return value;
+    if (typeof value === "string") {
+      const text = value.trim().toLowerCase();
+      if (text === "true") return true;
+      if (text === "false") return false;
+    }
+  }
+  return undefined;
+}
+
 function diagnosticLabel(value: unknown): string | undefined {
   const text = safeText(value).replace(/[^A-Za-z0-9_.:-]/gu, "_").slice(0, 80);
   return text || undefined;