refactor(native-chat): the status summary's broadcast equality gets its own module

The status feed crossed the file-size limit once the summary gained the main agent's turn
outcome beside the child views. Which summary changes reach every session list now lives in
structured-agent-session-status-summary-equality.ts.

src/main/native-chat/agent-session-wire/structured-agent-session-status-feed.ts

@@ -10,28 +10,24 @@
 // each chat is reopened. Restart is the one boundary that forgets, and restoring readable sessions
 // republishes them.
 
-import { agentProviderSessionsEqual } from '../../../shared/agent-session-resume'
 import type { AgentSessionRecord } from '../../../shared/agent-session-record'
 import { normalizeOptionalField } from '../../../shared/agent-status-field-normalization'
-import { isAgentStatusHeldOpenByChildWork } from '../../../shared/agent-lead-status-fold'
 import { AGENT_MODEL_MAX_LENGTH } from '../../../shared/agent-status-types'
-import {
-  agentSessionBackgroundTasksEqual,
-  type AgentSessionStatusEvent,
-  type AgentSessionStatusSummary
+import type {
+  AgentSessionStatusEvent,
+  AgentSessionStatusSummary
 } from '../../../shared/agent-session-wire'
 import type { AgentChildWorkEvidence } from '../../../shared/agent-status-child-work-evidence'
 import type { AgentChildWorkView } from '../../../shared/agent-status-child-work-view'
 import { projectStructuredAgentSessionStatusState } from '../../../shared/structured-agent-session-projection'
-import { structuredAgentSessionAgentStatus } from '../../../shared/structured-agent-session-agent-status'
 import type { AgentSessionJournal } from '../agent-session-journal/journal-store'
 import type { StructuredAgentSessionProviderChild } from './structured-agent-session-host-types'
 import { structuredAgentSessionProviderSessionMetadata } from './structured-agent-session-history-result'
 import {
   newestRootTurnId,
-  structuredStatusChildrenEqual,
   structuredStatusChildWork
 } from './structured-agent-session-status-child-work'
+import { structuredStatusSummariesEqual } from './structured-agent-session-status-summary-equality'
 import {
   StructuredAgentSessionStatusOwnership,
   type StructuredAgentSessionStatusSink
@@ -70,48 +66,6 @@ export type StructuredAgentSessionStatusFeedDeps = {
   onAgentStarted?: (sessionId: string) => void
 }
 
-function summariesEqual(a: AgentSessionStatusSummary, b: AgentSessionStatusSummary): boolean {
-  return (
-    a.workspaceId === b.workspaceId &&
-    a.agent === b.agent &&
-    a.status === b.status &&
-    a.hostExecutionOwned === b.hostExecutionOwned &&
-    a.hostExecutionPhase === b.hostExecutionPhase &&
-    a.hostExecutionChild?.generation === b.hostExecutionChild?.generation &&
-    a.hostExecutionChild?.fence === b.hostExecutionChild?.fence &&
-    a.rewindBlockedReason === b.rewindBlockedReason &&
-    // A moved state clock changes ranking; row activity alone, including a subagent's, does not.
-    // An idle state the journal cannot date still republishes, since readers date it by `updatedAt`,
-    // and so does one live child work holds open: readers take each publish as its evidence.
-    a.statusStartedAt === b.statusStartedAt &&
-    (a.status !== 'idle' ||
-      a.updatedAt === b.updatedAt ||
-      (a.statusStartedAt !== undefined && !isIdleHeldOpenByChildWork(b))) &&
-    a.latestPrompt === b.latestPrompt &&
-    a.model === b.model &&
-    a.toolName === b.toolName &&
-    a.toolInput === b.toolInput &&
-    a.lastAssistantMessage === b.lastAssistantMessage &&
-    a.turnOutcome === b.turnOutcome &&
-    structuredStatusChildrenEqual(a.children, b.children) &&
-    agentSessionBackgroundTasksEqual(a.backgroundTasks, b.backgroundTasks) &&
-    agentProviderSessionsEqual(undefined, a.providerSession, b.providerSession)
-  )
-}
-
-function isIdleHeldOpenByChildWork(summary: AgentSessionStatusSummary): boolean {
-  return (
-    summary.status === 'idle' &&
-    isAgentStatusHeldOpenByChildWork(
-      structuredAgentSessionAgentStatus({
-        status: summary.status,
-        backgroundTasks: summary.backgroundTasks,
-        turnOutcome: summary.turnOutcome
-      })
-    )
-  )
-}
-
 /** Wire the host's own deps into a feed; keeps the host at one call site.
  *  `deps` is a thunk because the host builds the feed in a field initializer,
  *  before its constructor parameters are assigned. */
@@ -250,7 +204,7 @@ export class StructuredAgentSessionStatusFeed {
     this.retireSettledChildrenOnNewTurn(sessionId, session, projection.rootTurnId)
     const summary = this.summaryFor(sessionId, session, source, record, projection.state)
     const previous = this.published.get(sessionId)
-    if (previous && summariesEqual(previous, summary)) {
+    if (previous && structuredStatusSummariesEqual(previous, summary)) {
       if (!this.ownership.matchesLocation(sessionId, session.params.location)) {
         this.sink(summary, session.params.location)
       }

src/main/native-chat/agent-session-wire/structured-agent-session-status-summary-equality.ts

@@ -0,0 +1,57 @@
+// Which status-summary changes reach every session list. The summary is broadcast to remote
+// subscribers too, so only a change a session list shows may re-send it.
+
+import { agentProviderSessionsEqual } from '../../../shared/agent-session-resume'
+import {
+  agentSessionBackgroundTasksEqual,
+  type AgentSessionStatusSummary
+} from '../../../shared/agent-session-wire'
+import { isAgentStatusHeldOpenByChildWork } from '../../../shared/agent-lead-status-fold'
+import { structuredAgentSessionAgentStatus } from '../../../shared/structured-agent-session-agent-status'
+import { structuredStatusChildrenEqual } from './structured-agent-session-status-child-work'
+
+export function structuredStatusSummariesEqual(
+  a: AgentSessionStatusSummary,
+  b: AgentSessionStatusSummary
+): boolean {
+  return (
+    a.workspaceId === b.workspaceId &&
+    a.agent === b.agent &&
+    a.status === b.status &&
+    a.hostExecutionOwned === b.hostExecutionOwned &&
+    a.hostExecutionPhase === b.hostExecutionPhase &&
+    a.hostExecutionChild?.generation === b.hostExecutionChild?.generation &&
+    a.hostExecutionChild?.fence === b.hostExecutionChild?.fence &&
+    a.rewindBlockedReason === b.rewindBlockedReason &&
+    // A moved state clock changes ranking; row activity alone, including a subagent's, does not.
+    // An idle state the journal cannot date still republishes, since readers date it by `updatedAt`,
+    // and so does one live child work holds open: readers take each publish as its evidence.
+    a.statusStartedAt === b.statusStartedAt &&
+    (a.status !== 'idle' ||
+      a.updatedAt === b.updatedAt ||
+      (a.statusStartedAt !== undefined && !isIdleHeldOpenByChildWork(b))) &&
+    a.latestPrompt === b.latestPrompt &&
+    a.model === b.model &&
+    a.toolName === b.toolName &&
+    a.toolInput === b.toolInput &&
+    a.lastAssistantMessage === b.lastAssistantMessage &&
+    a.turnOutcome === b.turnOutcome &&
+    agentSessionBackgroundTasksEqual(a.backgroundTasks, b.backgroundTasks) &&
+    structuredStatusChildrenEqual(a.children, b.children) &&
+    agentProviderSessionsEqual(undefined, a.providerSession, b.providerSession)
+  )
+}
+
+/** Held open by the host's child records, read the way every row reads them. */
+function isIdleHeldOpenByChildWork(summary: AgentSessionStatusSummary): boolean {
+  return (
+    summary.status === 'idle' &&
+    isAgentStatusHeldOpenByChildWork(
+      structuredAgentSessionAgentStatus({
+        status: summary.status,
+        childWork: summary.children ?? summary.backgroundTasks,
+        turnOutcome: summary.turnOutcome
+      })
+    )
+  )
+}