fix(renderer): keep process cadence timing browser-safe

config/scripts/agent-inspection-cadence-batching-benchmark.mjs

@@ -57,7 +57,7 @@ const { POLL_TIER_INTERVAL_MS } = await import(
   path.join(ROOT, 'src/renderer/src/components/terminal-pane/agent-completion-poll-cadence.ts')
 )
 const { PROCESS_TABLE_SNAPSHOT_MAX_STALENESS_MS } = await import(
-  path.join(ROOT, 'src/shared/process-table-snapshot-reader.ts')
+  path.join(ROOT, 'src/shared/process-table-snapshot-timing.ts')
 )
 
 // Pre-change: independent ±10% jitter per pane, re-rolled on every reschedule.

src/renderer/src/components/terminal-pane/agent-completion-poll-interval.test.ts

@@ -1,5 +1,6 @@
+import { build } from 'esbuild'
 import { describe, expect, it } from 'vitest'
-import { PROCESS_TABLE_SNAPSHOT_MAX_STALENESS_MS } from '../../../../shared/process-table-snapshot-reader'
+import { PROCESS_TABLE_SNAPSHOT_MAX_STALENESS_MS } from '../../../../shared/process-table-snapshot-timing'
 import { POLL_TIER_INTERVAL_MS } from './agent-completion-poll-cadence'
 import { nextCadenceInspectionDelayMs } from './agent-completion-poll-interval'
 
@@ -14,6 +15,18 @@ describe('nextCadenceInspectionDelayMs', () => {
       now
     })
 
+  it('keeps its production import graph browser-only', async () => {
+    await expect(
+      build({
+        bundle: true,
+        entryPoints: [`${import.meta.dirname}/agent-completion-poll-interval.ts`],
+        logLevel: 'silent',
+        platform: 'browser',
+        write: false
+      })
+    ).resolves.toMatchObject({ errors: [] })
+  })
+
   it('walks panes that scheduled at different moments onto one shared deadline', () => {
     // Why this matters: the inspection queue collapses shared-observation tasks enqueued in the
     // same tick onto one process-table capture, so a shared deadline is one `ps` for all panes.

src/renderer/src/components/terminal-pane/agent-completion-poll-interval.ts

@@ -1,4 +1,4 @@
-import { PROCESS_TABLE_SNAPSHOT_MAX_STALENESS_MS } from '../../../../shared/process-table-snapshot-reader'
+import { PROCESS_TABLE_SNAPSHOT_MAX_STALENESS_MS } from '../../../../shared/process-table-snapshot-timing'
 
 /**
  * Picks the delay until a pane's next cadence inspection.

src/shared/process-table-snapshot-reader.ts

@@ -2,6 +2,7 @@ import { execFile as execFileCb } from 'node:child_process'
 import { promisify } from 'node:util'
 import { readLinuxProcessStartTimes } from './linux-process-start-times'
 import { withEvidenceBudget } from './process-table-evidence-budget'
+import { PROCESS_TABLE_SNAPSHOT_MAX_STALENESS_MS } from './process-table-snapshot-timing'
 import {
   PS_ARGS,
   PS_MAX_BUFFER_BYTES,
@@ -17,6 +18,7 @@ export {
   PROCESS_TABLE_EVIDENCE_BUDGET_MS,
   withEvidenceBudget
 } from './process-table-evidence-budget'
+export { PROCESS_TABLE_SNAPSHOT_MAX_STALENESS_MS } from './process-table-snapshot-timing'
 
 const execFile = promisify(execFileCb)
 
@@ -26,7 +28,7 @@ const execFile = promisify(execFileCb)
 // whole subsystem answered "unverifiable" about a table it could read. This keeps a wedged
 // `ps` bounded while staying out of reach of a host that is merely busy.
 export const PS_TIMEOUT_MS = 15_000
-const DEFAULT_SNAPSHOT_TTL_MS = 500
+const DEFAULT_SNAPSHOT_TTL_MS = PROCESS_TABLE_SNAPSHOT_MAX_STALENESS_MS
 
 type Snapshot<T> = { value: T; capturedAtMs: number; completedAtMs: number }
 
@@ -282,10 +284,6 @@ export async function getStrictProcessTableSnapshotWithAge(): Promise<{
   return { rows: snapshot.value.strict(), capturedAgeMs: snapshot.capturedAgeMs }
 }
 
-/** How much older than its own await a TTL-cached capture may be, on top of the capture's own
- *  duration. Reported ages carry both, so this alone is not the staleness bound. */
-export const PROCESS_TABLE_SNAPSHOT_MAX_STALENESS_MS = DEFAULT_SNAPSHOT_TTL_MS
-
 export function resetProcessTableSnapshotForTests(): void {
   processTableReader.reset()
 }

src/shared/process-table-snapshot-timing.ts

@@ -0,0 +1,2 @@
+/** How long a completed shared process-table snapshot remains reusable, and the maximum cadence pull-forward. */
+export const PROCESS_TABLE_SNAPSHOT_MAX_STALENESS_MS = 500