diff --git a/.github/workflows/cloud-deploy-relay-production-same-cap-job.yml b/.github/workflows/cloud-deploy-relay-production-same-cap-job.yml
index d5c8134934b..0d3bf3cf398 100644
--- a/.github/workflows/cloud-deploy-relay-production-same-cap-job.yml
+++ b/.github/workflows/cloud-deploy-relay-production-same-cap-job.yml
@@ -433,13 +433,13 @@ jobs:
           # result's generation is authoritative either way.
           ISOLATE_RESULT="$(node dev/scripts/prepare-relay-production-capacity-canary.mjs \
             --director-origin "${DIRECTOR_ORIGIN}" --cell-origin "${CELL_ORIGIN}" \
-            --cell-id "${TARGET_CELL_ID}" --mode isolate)"
+            --cell-id "${TARGET_CELL_ID}" --approved-cells same-cap --mode isolate)"
           echo "${ISOLATE_RESULT}"
           ISOLATE_GENERATION="$(jq -er '.generation' <<< "${ISOLATE_RESULT}")"
           echo "SELECTOR_GENERATION_AFTER_ISOLATE=${ISOLATE_GENERATION}" >> "${GITHUB_ENV}"
           node dev/scripts/prepare-relay-production-capacity-canary.mjs \
             --director-origin "${DIRECTOR_ORIGIN}" --cell-origin "${CELL_ORIGIN}" \
-            --cell-id "${TARGET_CELL_ID}" --mode drain
+            --cell-id "${TARGET_CELL_ID}" --approved-cells same-cap --mode drain
           node dev/scripts/verify-relay-capacity-transition.mjs \
             --director-origin "${DIRECTOR_ORIGIN}" --cell-origin "${CELL_ORIGIN}" \
             --cell-id "${TARGET_CELL_ID}" --hard-cap "${EXPECTED_HARD_CAP}" \
@@ -613,7 +613,7 @@ jobs:
           echo "MUTATION_STARTED=true" >> "${GITHUB_ENV}"
           ACTIVATE_RESULT="$(node dev/scripts/prepare-relay-production-capacity-canary.mjs \
             --director-origin "${DIRECTOR_ORIGIN}" --cell-origin "${CELL_ORIGIN}" \
-            --cell-id "${TARGET_CELL_ID}" --mode activate)"
+            --cell-id "${TARGET_CELL_ID}" --approved-cells same-cap --mode activate)"
           echo "${ACTIVATE_RESULT}"
           SELECTOR_GENERATION_AFTER_ACTIVATE="$(jq -er '.generation' \
             <<< "${ACTIVATE_RESULT}")"
@@ -652,7 +652,7 @@ jobs:
           test "${MUTATION_STARTED:-false}" = true || exit 0
           ISOLATE_RESULT="$(node dev/scripts/prepare-relay-production-capacity-canary.mjs \
             --director-origin "${DIRECTOR_ORIGIN}" --cell-origin "${CELL_ORIGIN}" \
-            --cell-id "${TARGET_CELL_ID}" --mode isolate)"
+            --cell-id "${TARGET_CELL_ID}" --approved-cells same-cap --mode isolate)"
           echo "${ISOLATE_RESULT}"
           # The isolate result carries the authoritative post-isolate generation;
           # fixed offsets are wrong whenever an earlier isolate was a no-op.
diff --git a/cloud/dev/scripts/prepare-relay-production-capacity-canary.mjs b/cloud/dev/scripts/prepare-relay-production-capacity-canary.mjs
index e5c18237453..7967d164e4b 100644
--- a/cloud/dev/scripts/prepare-relay-production-capacity-canary.mjs
+++ b/cloud/dev/scripts/prepare-relay-production-capacity-canary.mjs
@@ -6,6 +6,7 @@ import {
   membershipWithStates,
   selectorCellState
 } from './relay-admission-selector.mjs'
+import { SAME_CAP_CELLS } from './relay-production-same-cap-wave.mjs'
 
 const DIRECTOR_ORIGIN = 'https://relay.onorca.dev'
 export const PRODUCTION_CAPACITY_CELL_IDS = [
@@ -31,6 +32,9 @@ function cellOrigin(cellId) {
   return `https://${cellId.slice('production-gce-'.length)}.relay.onorca.dev`
 }
 
+// The same-cap roll covers the Asia cells the US-only capacity rollout never touches.
+const APPROVED_CELL_LISTS = { 'same-cap': SAME_CAP_CELLS }
+
 export function parseProductionCapacityCellArguments(argv) {
   const values = {}
   for (let index = 0; index < argv.length; index += 2) {
@@ -42,8 +46,15 @@ export function parseProductionCapacityCellArguments(argv) {
   if (!['isolate', 'drain', 'activate'].includes(values.mode)) {
     throw new Error('--mode must be isolate, drain, or activate')
   }
+  const approvedList = values['approved-cells']
+  if (approvedList !== undefined && !APPROVED_CELL_LISTS[approvedList]) {
+    throw new Error('--approved-cells is not a known allowlist')
+  }
+  const approvedCellIds = approvedList === undefined
+    ? PRODUCTION_CAPACITY_CELL_IDS
+    : APPROVED_CELL_LISTS[approvedList]
   const cellId = values['cell-id']
-  if (!PRODUCTION_CAPACITY_CELL_IDS.includes(cellId)) {
+  if (!approvedCellIds.includes(cellId)) {
     throw new Error('production capacity target is not approved')
   }
   const expectedCellOrigin = cellOrigin(cellId)
diff --git a/cloud/dev/scripts/prepare-relay-production-capacity-canary.test.mjs b/cloud/dev/scripts/prepare-relay-production-capacity-canary.test.mjs
index ff397802860..274a60d2198 100644
--- a/cloud/dev/scripts/prepare-relay-production-capacity-canary.test.mjs
+++ b/cloud/dev/scripts/prepare-relay-production-capacity-canary.test.mjs
@@ -104,6 +104,47 @@ describe('production Relay capacity cell admission', () => {
       '--cell-id', 'production-gce-c7',
       '--mode', 'isolate'
     ]), /origin is not exact/)
+    assert.throws(() => parseProductionCapacityCellArguments([
+      '--director-origin', 'https://relay.onorca.dev',
+      '--cell-origin', 'https://c27.relay.onorca.dev',
+      '--cell-id', 'production-gce-c27',
+      '--mode', 'isolate'
+    ]), /not approved/)
+  })
+
+  it('admits the same-cap Asia cells only under the same-cap allowlist', () => {
+    for (const cellId of ['production-gce-c27', 'production-gce-c28', 'production-gce-c29']) {
+      const hostname = cellId.slice('production-gce-'.length)
+      assert.deepEqual(parseProductionCapacityCellArguments([
+        '--director-origin', 'https://relay.onorca.dev',
+        '--cell-origin', `https://${hostname}.relay.onorca.dev`,
+        '--cell-id', cellId,
+        '--approved-cells', 'same-cap',
+        '--mode', 'isolate'
+      ]), {
+        directorOrigin: 'https://relay.onorca.dev',
+        cellOrigin: `https://${hostname}.relay.onorca.dev`,
+        cellId,
+        mode: 'isolate'
+      })
+    }
+    for (const cellId of ['production-gce-c17', 'production-gce-c18', 'production-gce-c30']) {
+      const hostname = cellId.slice('production-gce-'.length)
+      assert.throws(() => parseProductionCapacityCellArguments([
+        '--director-origin', 'https://relay.onorca.dev',
+        '--cell-origin', `https://${hostname}.relay.onorca.dev`,
+        '--cell-id', cellId,
+        '--approved-cells', 'same-cap',
+        '--mode', 'isolate'
+      ]), /not approved/)
+    }
+    assert.throws(() => parseProductionCapacityCellArguments([
+      '--director-origin', 'https://relay.onorca.dev',
+      '--cell-origin', 'https://c27.relay.onorca.dev',
+      '--cell-id', 'production-gce-c27',
+      '--approved-cells', 'every-cell',
+      '--mode', 'isolate'
+    ]), /not a known allowlist/)
   })
 
   it('isolates only the selected cell without depending on its runtime', async () => {
diff --git a/cloud/dev/scripts/relay-same-cap-script-census.test.mjs b/cloud/dev/scripts/relay-same-cap-script-census.test.mjs
new file mode 100644
index 00000000000..714a1ee53e3
--- /dev/null
+++ b/cloud/dev/scripts/relay-same-cap-script-census.test.mjs
@@ -0,0 +1,75 @@
+import assert from 'node:assert/strict'
+import { spawnSync } from 'node:child_process'
+import { describe, it } from 'node:test'
+import { parseProductionCapacityCellArguments } from './prepare-relay-production-capacity-canary.mjs'
+import { SAME_CAP_CELLS } from './relay-production-same-cap-wave.mjs'
+import { readRelayWorkflow } from './relay-repository.mjs'
+
+const workflow = readRelayWorkflow('deploy-relay-production-same-cap-job.yml')
+const capacityWorkflow = readRelayWorkflow('deploy-relay-production-capacity-job.yml')
+
+function hostname(cellId) {
+  return cellId.slice('production-gce-'.length)
+}
+
+// The job resolves cap and region from the cell id before any admin call; run that block alone.
+function resolveCellShape(cellId) {
+  const start = workflow.indexOf('          TARGET_HOSTNAME="${TARGET_CELL_ID#production-gce-}"')
+  assert.notEqual(start, -1, 'the same-cap cell shape block is missing')
+  const end = workflow.indexOf('\n          esac\n', start)
+  assert.notEqual(end, -1, 'the same-cap cell shape block has no esac')
+  const script = workflow.slice(start, end + '\n          esac'.length).replace(/^ {10}/gm, '')
+  return spawnSync('bash', [
+    '-euo',
+    'pipefail',
+    '-c',
+    `${script}\necho "\${EXPECTED_REGION} \${EXPECTED_HARD_CAP}"`
+  ], { env: { ...process.env, TARGET_CELL_ID: cellId }, encoding: 'utf8' })
+}
+
+describe('same-cap roll scripts accept every same-cap cell', () => {
+  it('parses every wave cell through the same-cap canary allowlist', () => {
+    for (const cellId of SAME_CAP_CELLS) {
+      for (const mode of ['isolate', 'drain', 'activate']) {
+        assert.deepEqual(parseProductionCapacityCellArguments([
+          '--director-origin', 'https://relay.onorca.dev',
+          '--cell-origin', `https://${hostname(cellId)}.relay.onorca.dev`,
+          '--cell-id', cellId,
+          '--approved-cells', 'same-cap',
+          '--mode', mode
+        ]), {
+          directorOrigin: 'https://relay.onorca.dev',
+          cellOrigin: `https://${hostname(cellId)}.relay.onorca.dev`,
+          cellId,
+          mode
+        })
+      }
+    }
+  })
+
+  it('resolves a cap and region for every wave cell and refuses anything else', () => {
+    for (const cellId of SAME_CAP_CELLS) {
+      const resolved = resolveCellShape(cellId)
+      assert.equal(resolved.status, 0, `${cellId}: ${resolved.stderr}`)
+      assert.match(resolved.stdout.trim(), /^(us-central1 1000|asia-east2 3000)$/)
+    }
+    assert.equal(resolveCellShape('production-gce-c17').status, 1)
+    assert.equal(resolveCellShape('production-gce-c30').status, 1)
+  })
+
+  it('passes the same-cap allowlist on every canary invocation the job runs', () => {
+    const invocations = workflow.split('prepare-relay-production-capacity-canary.mjs').slice(1)
+    assert.equal(invocations.length, 4)
+    for (const invocation of invocations) {
+      const lines = invocation.split('\n')
+      const end = lines.findIndex((line) => !line.endsWith('\\'))
+      const call = lines.slice(0, end + 1).join(' ')
+      assert.match(call, /--approved-cells same-cap/)
+      assert.match(call, /--mode (isolate|drain|activate)/)
+    }
+  })
+
+  it('leaves the US-only capacity job on the default allowlist', () => {
+    assert.doesNotMatch(capacityWorkflow, /--approved-cells/)
+  })
+})
diff --git a/cloud/package.json b/cloud/package.json
index 788b6ea2629..62dbadc7455 100644
--- a/cloud/package.json
+++ b/cloud/package.json
@@ -21,7 +21,7 @@
     "load:relay:recovery-gate": "node dev/scripts/run-relay-recovery-wave-gate.mjs",
     "ops:relay": "pnpm --filter @orca-cloud/relay-ops dev",
     "pretest": "node --test dev/scripts/capture-terraform-plan-baseline.test.mjs dev/scripts/operate-relay-asia-admission.test.mjs dev/scripts/prepare-relay-asia-director-cells.test.mjs dev/scripts/prepare-relay-asia-topology-input.test.mjs dev/scripts/production-cloud-sql-rollout-lock.test.mjs dev/scripts/read-relay-serving-regional-placement-version.test.mjs dev/scripts/relay-asia-admission-workflow.test.mjs dev/scripts/relay-asia-rollout-evidence.test.mjs dev/scripts/relay-asia-topology-workflow.test.mjs dev/scripts/relay-cloud-sql-connection-budget.test.mjs dev/scripts/relay-load-reader-evidence.test.mjs dev/scripts/relay-staging-deploy-identity.test.mjs dev/scripts/sanitize-relay-asia-admission-result.test.mjs dev/scripts/terraform-root-partition.test.mjs dev/scripts/validate-relay-asia-topology-plan.test.mjs ../.github/actions/cloud-sql-rollout-lease/action-contract.test.mjs ../.github/actions/cloud-sql-rollout-lease/storage-lease.test.mjs",
-    "test": "pnpm -r test && node --test dev/scripts/classify-relay-production-capacity-director.test.mjs dev/scripts/classify-relay-staging-bootstrap.test.mjs dev/scripts/deploy-relay-blue-green.test.mjs dev/scripts/deploy-relay-gce-candidate.test.mjs dev/scripts/deploy-relay-gce-multi-target.test.mjs dev/scripts/github-smoke-token.test.mjs dev/scripts/infra.test.mjs dev/scripts/operate-relay-regional-rehome.test.mjs dev/scripts/power-staging-relay.test.mjs dev/scripts/prepare-relay-capacity-canary.test.mjs dev/scripts/prepare-relay-production-capacity-canary.test.mjs dev/scripts/probe-relay-legacy-admission.test.mjs dev/scripts/probe-relay-rehome-trust.test.mjs dev/scripts/production-cell-image-digest-consistency.test.mjs dev/scripts/read-relay-production-capacity-identity.test.mjs dev/scripts/relay-admin-endpoint-retry-workflow.test.mjs dev/scripts/relay-admin-transient-retry.test.mjs dev/scripts/relay-admission-selector.test.mjs dev/scripts/relay-gce-terraform-fence.test.mjs dev/scripts/relay-load-connection-failure.test.mjs dev/scripts/relay-load-control-peer.test.mjs dev/scripts/relay-load-director-capacity-gate.test.mjs dev/scripts/relay-load-model.test.mjs dev/scripts/relay-load-phase-barrier.test.mjs dev/scripts/relay-load-placement-boundary.test.mjs dev/scripts/relay-load-profile.test.mjs dev/scripts/relay-load-rebind-boundary.test.mjs dev/scripts/relay-load-region-behavior.test.mjs dev/scripts/relay-load-request-unit-boundary.test.mjs dev/scripts/relay-load-run-lifecycle.test.mjs dev/scripts/relay-monitor-evidence.test.mjs dev/scripts/relay-production-capacity-wave.test.mjs dev/scripts/relay-production-capacity-workflow.test.mjs dev/scripts/relay-production-identity-boundaries.test.mjs dev/scripts/relay-production-same-cap-wave.test.mjs dev/scripts/relay-public-workflow-contract.test.mjs dev/scripts/relay-recovery-wave-gate.test.mjs dev/scripts/relay-region-observation-evidence.test.mjs dev/scripts/relay-regional-rehome-workflow.test.mjs dev/scripts/relay-rehome-aggregate-evidence.test.mjs dev/scripts/relay-repository.test.mjs dev/scripts/relay-staging-c4-refresh-workflow.test.mjs dev/scripts/relay-staging-capacity-identity.test.mjs dev/scripts/staging-relay-apply-guard.test.mjs dev/scripts/validate-relay-capacity-plan.test.mjs dev/scripts/verify-relay-capacity-transition.test.mjs dev/scripts/verify-relay-legacy-bootstrap.test.mjs dev/scripts/workload-identity-attribute-conditions.test.mjs",
+    "test": "pnpm -r test && node --test dev/scripts/classify-relay-production-capacity-director.test.mjs dev/scripts/classify-relay-staging-bootstrap.test.mjs dev/scripts/deploy-relay-blue-green.test.mjs dev/scripts/deploy-relay-gce-candidate.test.mjs dev/scripts/deploy-relay-gce-multi-target.test.mjs dev/scripts/github-smoke-token.test.mjs dev/scripts/infra.test.mjs dev/scripts/operate-relay-regional-rehome.test.mjs dev/scripts/power-staging-relay.test.mjs dev/scripts/prepare-relay-capacity-canary.test.mjs dev/scripts/prepare-relay-production-capacity-canary.test.mjs dev/scripts/probe-relay-legacy-admission.test.mjs dev/scripts/probe-relay-rehome-trust.test.mjs dev/scripts/production-cell-image-digest-consistency.test.mjs dev/scripts/read-relay-production-capacity-identity.test.mjs dev/scripts/relay-admin-endpoint-retry-workflow.test.mjs dev/scripts/relay-admin-transient-retry.test.mjs dev/scripts/relay-admission-selector.test.mjs dev/scripts/relay-gce-terraform-fence.test.mjs dev/scripts/relay-load-connection-failure.test.mjs dev/scripts/relay-load-control-peer.test.mjs dev/scripts/relay-load-director-capacity-gate.test.mjs dev/scripts/relay-load-model.test.mjs dev/scripts/relay-load-phase-barrier.test.mjs dev/scripts/relay-load-placement-boundary.test.mjs dev/scripts/relay-load-profile.test.mjs dev/scripts/relay-load-rebind-boundary.test.mjs dev/scripts/relay-load-region-behavior.test.mjs dev/scripts/relay-load-request-unit-boundary.test.mjs dev/scripts/relay-load-run-lifecycle.test.mjs dev/scripts/relay-monitor-evidence.test.mjs dev/scripts/relay-production-capacity-wave.test.mjs dev/scripts/relay-production-capacity-workflow.test.mjs dev/scripts/relay-production-identity-boundaries.test.mjs dev/scripts/relay-production-same-cap-wave.test.mjs dev/scripts/relay-public-workflow-contract.test.mjs dev/scripts/relay-recovery-wave-gate.test.mjs dev/scripts/relay-region-observation-evidence.test.mjs dev/scripts/relay-regional-rehome-workflow.test.mjs dev/scripts/relay-rehome-aggregate-evidence.test.mjs dev/scripts/relay-repository.test.mjs dev/scripts/relay-same-cap-script-census.test.mjs dev/scripts/relay-staging-c4-refresh-workflow.test.mjs dev/scripts/relay-staging-capacity-identity.test.mjs dev/scripts/staging-relay-apply-guard.test.mjs dev/scripts/validate-relay-capacity-plan.test.mjs dev/scripts/verify-relay-capacity-transition.test.mjs dev/scripts/verify-relay-legacy-bootstrap.test.mjs dev/scripts/workload-identity-attribute-conditions.test.mjs",
     "typecheck": "pnpm -r typecheck"
   },
   "devDependencies": {
diff --git a/config/scripts/agent-inspection-cadence-batching-benchmark.mjs b/config/scripts/agent-inspection-cadence-batching-benchmark.mjs
index 5ececab3298..128627676c4 100644
--- a/config/scripts/agent-inspection-cadence-batching-benchmark.mjs
+++ b/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-timing.ts')
+  path.join(ROOT, 'src/shared/process-table-snapshot-reader.ts')
 )
 
 // Pre-change: independent ±10% jitter per pane, re-rolled on every reschedule.
diff --git a/src/main/git/worktree-base-divergence-real-git.test.ts b/src/main/git/worktree-base-divergence-real-git.test.ts
index 377b63b48f9..4aa1734c792 100644
--- a/src/main/git/worktree-base-divergence-real-git.test.ts
+++ b/src/main/git/worktree-base-divergence-real-git.test.ts
@@ -3,6 +3,7 @@ import { mkdtemp, rm, writeFile } from 'node:fs/promises'
 import { tmpdir } from 'node:os'
 import { join } from 'node:path'
 import { afterEach, describe, expect, it } from 'vitest'
+import { GIT_FETCH_SKIP_AUTO_MAINTENANCE_CONFIG_ARGS } from '../../shared/git-fetch-auto-maintenance'
 import {
   measureRetargetDivergence,
   RETARGET_MAX_COMMIT_DIVERGENCE
@@ -10,8 +11,13 @@ import {
 
 const tempRoots: string[] = []
 
+// Why the maintenance suppression: `git commit` detaches `git maintenance run --auto`, and its
+// commit-graph task arms once a fixture crosses 100 new commits — which the cap-sized histories
+// below always do. That detached process keeps writing `.git/objects/info/commit-graphs` after the
+// synchronous exec has returned, so it re-creates entries under a `.git/objects` the temp-root
+// teardown is midway through deleting, and the recursive remove dies with ENOTEMPTY.
 function git(cwd: string, args: string[]): string {
-  return execFileSync('git', args, {
+  return execFileSync('git', [...GIT_FETCH_SKIP_AUTO_MAINTENANCE_CONFIG_ARGS, ...args], {
     cwd,
     encoding: 'utf8',
     stdio: ['pipe', 'pipe', 'pipe']
diff --git a/src/renderer/src/components/terminal-pane/agent-completion-poll-interval.test.ts b/src/renderer/src/components/terminal-pane/agent-completion-poll-interval.test.ts
index fb85fb0f212..fffbb94de90 100644
--- a/src/renderer/src/components/terminal-pane/agent-completion-poll-interval.test.ts
+++ b/src/renderer/src/components/terminal-pane/agent-completion-poll-interval.test.ts
@@ -1,6 +1,5 @@
-import { build } from 'esbuild'
 import { describe, expect, it } from 'vitest'
-import { PROCESS_TABLE_SNAPSHOT_MAX_STALENESS_MS } from '../../../../shared/process-table-snapshot-timing'
+import { PROCESS_TABLE_SNAPSHOT_MAX_STALENESS_MS } from '../../../../shared/process-table-snapshot-reader'
 import { POLL_TIER_INTERVAL_MS } from './agent-completion-poll-cadence'
 import { nextCadenceInspectionDelayMs } from './agent-completion-poll-interval'
 
@@ -15,18 +14,6 @@ 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.
diff --git a/src/renderer/src/components/terminal-pane/agent-completion-poll-interval.ts b/src/renderer/src/components/terminal-pane/agent-completion-poll-interval.ts
index 79c1c6bd439..0de8632f552 100644
--- a/src/renderer/src/components/terminal-pane/agent-completion-poll-interval.ts
+++ b/src/renderer/src/components/terminal-pane/agent-completion-poll-interval.ts
@@ -1,4 +1,6 @@
-import { PROCESS_TABLE_SNAPSHOT_MAX_STALENESS_MS } from '../../../../shared/process-table-snapshot-timing'
+// Why not the sibling reader that re-exports this: it imports `node:child_process`, which the
+// renderer cannot load — reaching it blanks the window at module evaluation.
+import { PROCESS_TABLE_SNAPSHOT_MAX_STALENESS_MS } from '../../../../shared/process-table-snapshot'
 
 /**
  * Picks the delay until a pane's next cadence inspection.
diff --git a/src/renderer/src/renderer-node-builtin-boundary.test.ts b/src/renderer/src/renderer-node-builtin-boundary.test.ts
new file mode 100644
index 00000000000..1cc28bd73af
--- /dev/null
+++ b/src/renderer/src/renderer-node-builtin-boundary.test.ts
@@ -0,0 +1,111 @@
+import { existsSync, readFileSync } from 'node:fs'
+import path from 'node:path'
+import { describe, expect, it } from 'vitest'
+
+/**
+ * The renderer runs sandboxed with contextIsolation: `node:*` builtins do not resolve and even a
+ * bare `process` read throws. A module that reaches one is not a degraded feature — the chunk
+ * fails at evaluation, React never mounts, and the window stays blank with `workspaceSessionReady`
+ * stuck false (#18742 did exactly this by importing one constant out of a `node:child_process`
+ * module). Bundling hides it: the offending module can sit in a shared chunk far from the import
+ * that pulled it in.
+ *
+ * So walk the import graph from every renderer entry — lazy routes included, since a `node:`
+ * builtin behind one is just a blank route instead of a blank app — and refuse any builtin.
+ */
+const RENDERER_SRC = import.meta.dirname
+const REPO_SRC = path.resolve(RENDERER_SRC, '../..')
+const ENTRIES = ['main.tsx', 'popout.tsx', 'web/main.tsx']
+const EXTENSIONS = ['.ts', '.tsx', '.js', '.jsx']
+
+/** `import`/`export ... from` and `import(...)` specifiers, minus type-only ones, which erase. */
+function collectValueImportSpecifiers(source: string): string[] {
+  const specifiers: string[] = []
+  const pattern =
+    /(?:^|[\s;}])(?:import|export)(\s+type\s|\s*\{[^}]*\}|[^'"]*?)?\s*from\s*['"]([^'"]+)['"]|(?:^|[\s;}])import\s*['"]([^'"]+)['"]|import\s*\(\s*['"]([^'"]+)['"]\s*\)/g
+  for (const match of source.matchAll(pattern)) {
+    const clause = match[1] ?? ''
+    const specifier = match[2] ?? match[3] ?? match[4]
+    if (!specifier || /^\s*type\s/.test(clause)) {
+      continue
+    }
+    // A brace clause whose every binding is `type`-prefixed also erases entirely.
+    const bindings = clause.trim().startsWith('{') ? clause.trim().slice(1, -1).split(',') : null
+    if (bindings && bindings.some((b) => b.trim()) && bindings.every((b) => /^\s*type\s/.test(b))) {
+      continue
+    }
+    specifiers.push(specifier)
+  }
+  return specifiers
+}
+
+function resolveModule(specifier: string, fromFile: string): string | null {
+  let base: string
+  if (specifier.startsWith('@renderer/')) {
+    base = path.join(RENDERER_SRC, specifier.slice('@renderer/'.length))
+  } else if (specifier.startsWith('@/')) {
+    base = path.join(RENDERER_SRC, specifier.slice(2))
+  } else if (specifier.startsWith('.')) {
+    base = path.resolve(path.dirname(fromFile), specifier)
+  } else {
+    // Bare package specifiers are npm dependencies, not first-party source.
+    return null
+  }
+  for (const candidate of [
+    ...EXTENSIONS.map((ext) => `${base}${ext}`),
+    ...EXTENSIONS.map((ext) => path.join(base, `index${ext}`))
+  ]) {
+    if (existsSync(candidate)) {
+      return candidate
+    }
+  }
+  return null
+}
+
+function walkRendererImportGraph(): Map<string, string[]> {
+  /** file -> the chain of first-party importers that reached it, entry first. */
+  const pathToFile = new Map<string, string[]>()
+  const queue: string[] = []
+  for (const entry of ENTRIES) {
+    const file = path.join(RENDERER_SRC, entry)
+    pathToFile.set(file, [file])
+    queue.push(file)
+  }
+  while (queue.length > 0) {
+    const file = queue.shift() as string
+    const chain = pathToFile.get(file) as string[]
+    for (const specifier of collectValueImportSpecifiers(readFileSync(file, 'utf8'))) {
+      const resolved = resolveModule(specifier, file)
+      if (!resolved || pathToFile.has(resolved)) {
+        continue
+      }
+      pathToFile.set(resolved, [...chain, resolved])
+      queue.push(resolved)
+    }
+  }
+  return pathToFile
+}
+
+describe('renderer node-builtin boundary', () => {
+  it('reaches no module that imports a node: builtin', () => {
+    const graph = walkRendererImportGraph()
+    const offenders: string[] = []
+    for (const [file, chain] of graph) {
+      const builtins = collectValueImportSpecifiers(readFileSync(file, 'utf8')).filter(
+        (specifier) => specifier.startsWith('node:')
+      )
+      if (builtins.length === 0) {
+        continue
+      }
+      const relativeChain = chain.map((step) => path.relative(REPO_SRC, step)).join('\n    -> ')
+      offenders.push(`${builtins.join(', ')} via\n    ${relativeChain}`)
+    }
+    expect(offenders.join('\n\n')).toBe('')
+  })
+
+  it('walks a real graph, so an empty offender list means something', () => {
+    const graph = walkRendererImportGraph()
+    expect(graph.size).toBeGreaterThan(3_000)
+    expect(graph.has(path.join(REPO_SRC, 'shared/process-table-snapshot.ts'))).toBe(true)
+  })
+})
diff --git a/src/shared/process-table-snapshot-reader.ts b/src/shared/process-table-snapshot-reader.ts
index 764fb89f205..2215a1d2af7 100644
--- a/src/shared/process-table-snapshot-reader.ts
+++ b/src/shared/process-table-snapshot-reader.ts
@@ -2,8 +2,8 @@ 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 {
+  PROCESS_TABLE_SNAPSHOT_MAX_STALENESS_MS,
   PS_ARGS,
   PS_MAX_BUFFER_BYTES,
   ProcessTableCaptureError,
@@ -12,13 +12,12 @@ import {
   type ProcessTableRow
 } from './process-table-snapshot'
 
-export { PS_ARGS, PS_MAX_BUFFER_BYTES }
 export { parseLinuxProcStatStartTime } from './linux-process-start-times'
 export {
   PROCESS_TABLE_EVIDENCE_BUDGET_MS,
   withEvidenceBudget
 } from './process-table-evidence-budget'
-export { PROCESS_TABLE_SNAPSHOT_MAX_STALENESS_MS } from './process-table-snapshot-timing'
+export { PROCESS_TABLE_SNAPSHOT_MAX_STALENESS_MS, PS_ARGS, PS_MAX_BUFFER_BYTES }
 
 const execFile = promisify(execFileCb)
 
diff --git a/src/shared/process-table-snapshot-timing.ts b/src/shared/process-table-snapshot-timing.ts
deleted file mode 100644
index eaa3621728c..00000000000
--- a/src/shared/process-table-snapshot-timing.ts
+++ /dev/null
@@ -1,2 +0,0 @@
-/** 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
diff --git a/src/shared/process-table-snapshot.ts b/src/shared/process-table-snapshot.ts
index 0acc6f6f9e9..3b3236079c4 100644
--- a/src/shared/process-table-snapshot.ts
+++ b/src/shared/process-table-snapshot.ts
@@ -13,9 +13,14 @@ export type ProcessTableRow = {
   command: string
 }
 
+// Why guarded: this module is the renderer-safe half of the process-table pair, and the renderer
+// runs sandboxed with contextIsolation, where a bare `process` read throws at module evaluation
+// and takes the whole chunk — and the app — down with it. Only hosts ever run these argv.
+const HOST_IS_DARWIN = typeof process !== 'undefined' && process.platform === 'darwin'
+
 /** Columns used by the evidence reader. Keep command last so its spaces survive parsing. */
 export const PS_ARGS = (
-  process.platform === 'darwin'
+  HOST_IS_DARWIN
     ? ['-axo', 'pid=,ppid=,pgid=,tpgid=,stat=,tty=,lstart=,command=']
     : ['-axo', 'pid=,ppid=,pgid=,tpgid=,stat=,tty=,etimes=,command=']
 ) as readonly string[]
@@ -28,7 +33,7 @@ export const PS_ARGS = (
  * marker comes from `/proc/<pid>/stat` for the pane subtree only.
  */
 export const CHEAP_PS_ARGS = (
-  process.platform === 'darwin'
+  HOST_IS_DARWIN
     ? ['-axo', 'pid=,ppid=,pgid=,tpgid=,stat=,lstart=']
     : ['-axo', 'pid=,ppid=,pgid=,tpgid=,stat=']
 ) as readonly string[]
@@ -80,6 +85,14 @@ export function parseCheapProcessTableRows(stdout: string): CheapProcessTableRow
 // "unverifiable". Matches the sibling reader in pty-descendant-termination.ts.
 export const PS_MAX_BUFFER_BYTES = 32 * 1024 * 1024
 
+/** 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.
+ *
+ *  Why here and not beside the reader that applies it: the renderer's cadence scheduler pulls a
+ *  pane's next poll forward by at most this much, and the reader is a `node:child_process` module
+ *  the renderer must never reach. */
+export const PROCESS_TABLE_SNAPSHOT_MAX_STALENESS_MS = 500
+
 /**
  * Parse legacy or evidence-shaped `ps` output into rows. Tolerates CRLF so a
  * snapshot parsed on any host stays correct; `command` (last field) keeps its