perf: coalesce concurrent process snapshots across diagnostics and restore - #13014
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📝 WalkthroughWalkthroughThe PR adds a shared actor for coordinated process snapshots, separates minimal capture from enrichment, and converts process-snapshot consumers to async APIs. It adds process sampling, availability metadata, PID-reuse checks, scope reprobes, diagnostic integration, and concurrency tests. ChangesProcess snapshot coordination
Priority: ➖ Normal Estimated code review effort: 5 (Critical) | ~90 minutes Change: Feature · Severity of issue fixed: Medium Sequence Diagram(s)sequenceDiagram
participant DiagnosticConsumer
participant ProcessSnapshotService
participant CmuxTopProcessSampler
participant TerminalController
DiagnosticConsumer->>TerminalController: request system.top or system.memory
TerminalController->>ProcessSnapshotService: request cached process fields
ProcessSnapshotService->>CmuxTopProcessSampler: capture or enrich shared census
CmuxTopProcessSampler-->>ProcessSnapshotService: process snapshot
ProcessSnapshotService-->>TerminalController: coordinated snapshot
TerminalController-->>DiagnosticConsumer: diagnostic response
Merge Risk: 🟡 Moderate · up to Snapshot failures or stale timestamps can produce incorrect agent lifecycle state, including an unrecoverable read-only session. These material paths should be fixed before merge. Important Pre-merge checks failedPlease resolve all errors before merging. Addressing warnings is optional. ❌ Failed checks (3 errors, 1 warning)
✅ Passed checks (21 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 17.12% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 111 functions across 52 files. (9 skipped: 1 unsupported, 1 too large, 7 over the file limit.) Full details: Cmux Swift Blocking RuntimeExplanation The PR materially expands production semaphore blocking. In Resolution Remove the new Full details: Cmux Swift Package BoundariesExplanation The PR introduces core process-census logic in the app target instead of a SwiftPM target. Resolution Create a small macOS SwiftPM target named Full details: Cmux Full InternationalizationExplanation The diff adds production control-socket API response text without localization. Resolution Route both API messages through stable localized keys, such as ✨ Finishing Touches 💡 2📝 Generate docstrings 💡
🛠️ Fix failing CI checks 💡
🧪 Generate unit tests (beta)
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Inline comments:
In `@Sources/CmuxTopProcessSnapshotCaptureCoordinator.swift`:
- Line 109: Update InFlightCapture and the captureCached join logic so an
in-flight generation records its start instant and is joined only when its
requirements are compatible and its age remains within maximumAge; otherwise
wait for the existing generation to finish before starting a new one. Add a
deterministic test that keeps the first capture blocked, advances nowProvider
beyond maximumAge, and verifies a fresh generation is started.
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Sources/CmuxTopProcessEnumeration.swiftSources/CmuxTopProcessSnapshotCache.swiftSources/CmuxTopProcessSnapshotCaptureCoordinator.swiftcmux.xcodeproj/project.pbxprojcmuxTests/CmuxTopProcessSnapshotCaptureCoordinatorTests.swift
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Inline comments:
In `@Sources/CmuxTopProcessSnapshotCaptureCoordinator.swift`:
- Line 91: Update capture’s age-rejection flow in
CmuxTopProcessSnapshotCaptureCoordinator to retain the rejected generation
boundary, bypass cachedSnapshot afterward, and only start or join a generation
with a later sequence. Make inFlightFreshnessBound deterministic by
synchronizing the second request after coordinator arrival and using the
injected SyntheticSnapshotClock for the fixture’s sampledAt instead of Date() or
Task.yield().
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Sources/CmuxTopProcessSnapshotCaptureCoordinator.swiftSources/CmuxTopProcessSnapshotInFlightCapture.swiftcmuxTests/CmuxTopProcessSnapshotCaptureCoordinatorTests.swift
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Inline comments:
In `@cmuxTests/CmuxTopProcessSnapshotCaptureCoordinatorTests.swift`:
- Line 136: Update the concurrentRequestsCoalesce fixture to require an injected
timestamp provider instead of defaulting to Date(), and use the same
SyntheticSnapshotClock instance for both the fixture and coordinator. Ensure the
test advances or controls synthetic time so maximumAge: 2 remains deterministic
and no wall-clock dependency remains.
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Sources/CmuxTopProcessSnapshotCaptureCoordinator.swiftcmuxTests/CmuxTopProcessSnapshotCaptureCoordinatorTests.swift
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Inline comments:
In `@cmuxTests/CmuxTopProcessSnapshotCaptureCoordinatorTests.swift`:
- Around line 124-131: Inject the synthetic reader’s deterministic clock into
ProcessSnapshotService by passing reader.now to its now dependency. Add a
mutable ContinuousClock.Instant to SyntheticProcessSnapshotReader.State and have
now() return that value; advance it only in tests that intentionally cross the
freshness boundary, keeping this capture-and-cache test’s time fixed.
In `@cmuxTests/SyntheticProcessSnapshotReader.swift`:
- Line 13: Add an explicit empty deinit to SyntheticProcessSnapshotReader so it
satisfies the configured SwiftLint required_deinit rule.
In
`@Packages/macOS/CmuxFoundation/Tests/CmuxFoundationTests/ProcessSnapshotTestClock.swift`:
- Line 5: Add explicit empty deinit implementations to both
ProcessSnapshotTestClock and ProcessSnapshotTestValue to satisfy the
required_deinit SwiftLint rule, without changing their existing behavior.
In `@Sources/App/AgentHibernationProcessSnapshotCoordinator.swift`:
- Around line 212-214: Update the snapshot authorization check in
AgentHibernationProcessSnapshotCoordinator to require a non-nil processIdentity
and require it to equal the probed identity, rejecting otherwise. Update
affected process-record fixtures to provide processIdentity values.
In `@Sources/AppDelegate`+WorkspaceActionSave.swift:
- Around line 190-192: Update the Save workspace layout flow around
captureConfigActionSnapshot to use a per-window presentation owner that
serializes only Save requests: reject duplicate requests while that window’s
Save capture or sheet is active, but allow Save presentation to queue behind
unrelated sheets. Ensure the owner state is cleared on every completion and
early-abort path, including cancellation, invisibility, capture failure, and
sheet dismissal; do not rely solely on window.attachedSheet.
In `@Sources/CmuxTopProcessSampler`+Enrichment.swift:
- Around line 24-35: In the enrichment flow around the two
reader.matches(pid:key:) probes, add a readsForeignData condition that is true
when missing contains .details or .scope, then gate both identity checks on that
condition. Skip both probes for resource-only enrichment while preserving the
existing missingCount and continue behavior when identity-sensitive reads are
requested.
In `@Sources/Mobile/AgentChat/AgentChatSessionRegistry.swift`:
- Line 207: Update liveAgentPID and its caller in AgentChatSessionRegistry so
unavailable or incomplete process-census data is represented separately from a
genuinely absent agent PID. Have liveAgentPID return a resolved outcome only for
a complete available census, and make the session-update path leave the record
unchanged for censusUnavailable; only a resolved nil may transition the session
to .ended.
In `@Sources/SharedLiveAgentIndexLoader.swift`:
- Line 55: Update the SharedLiveAgentIndexLoader construction in
loadFreshResult() to inject capturedAtProvider using
snapshot.sampledAt.timeIntervalSince1970, while preserving the existing
processSnapshotProvider and synchronous loading behavior.
In `@Sources/TerminalController.swift`:
- Around line 1734-1745: Treat this as an optional, profiling-driven
optimization: if justified, expose a typed system.top result via a new
systemTopResult method, have v2SystemTopAsync encode that result only at the
wire boundary, and update the system.top branch to consume systemTopResult
directly instead of parsing v2SystemTopAsync output. Preserve existing error and
success mappings.
In `@Sources/TerminalController`+ProcessDiagnostics.swift:
- Around line 7-8: Update taskManagerTopPayload to call Task.checkCancellation()
before v2RefreshKnownRefs() and the topology traversal, preserving cancellation
propagation before any refresh work begins.
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📒 Files selected for processing (59)
Packages/macOS/CmuxFoundation/Sources/CmuxFoundation/Process/ProcessSnapshotCensus.swiftPackages/macOS/CmuxFoundation/Sources/CmuxFoundation/Process/ProcessSnapshotError.swiftPackages/macOS/CmuxFoundation/Sources/CmuxFoundation/Process/ProcessSnapshotFreshness.swiftPackages/macOS/CmuxFoundation/Sources/CmuxFoundation/Process/ProcessSnapshotOperation.swiftPackages/macOS/CmuxFoundation/Sources/CmuxFoundation/Process/ProcessSnapshotService.swiftPackages/macOS/CmuxFoundation/Sources/CmuxFoundation/Process/ProcessSnapshotWaiter.swiftPackages/macOS/CmuxFoundation/Tests/CmuxFoundationTests/ProcessSnapshotServiceTests.swiftPackages/macOS/CmuxFoundation/Tests/CmuxFoundationTests/ProcessSnapshotTestClock.swiftPackages/macOS/CmuxFoundation/Tests/CmuxFoundationTests/ProcessSnapshotTestClockState.swiftPackages/macOS/CmuxFoundation/Tests/CmuxFoundationTests/ProcessSnapshotTestFields.swiftPackages/macOS/CmuxFoundation/Tests/CmuxFoundationTests/ProcessSnapshotTestProvider.swiftPackages/macOS/CmuxFoundation/Tests/CmuxFoundationTests/ProcessSnapshotTestValue.swiftSources/App/AgentHibernationProcessSnapshotCoordinator.swiftSources/App/MemoryPressureAggregateSampler.swiftSources/App/MemoryPressureMonitor.swiftSources/AppDelegate+WorkspaceActionSave.swiftSources/CmuxTopProcessCapture.swiftSources/CmuxTopProcessEnumeration.swiftSources/CmuxTopProcessFields.swiftSources/CmuxTopProcessInfo.swiftSources/CmuxTopProcessReader.swiftSources/CmuxTopProcessReading.swiftSources/CmuxTopProcessSampler+Enrichment.swiftSources/CmuxTopProcessSampler.swiftSources/CmuxTopProcessSnapshotCache.swiftSources/CmuxTopSnapshot.swiftSources/CmuxTopSnapshotScopeCache.swiftSources/MemoryResourceSample.swiftSources/Mobile/AgentChat/AgentChatSessionRegistry+LiveAgentPID.swiftSources/Mobile/AgentChat/AgentChatSessionRegistry+ObserveScan.swiftSources/Mobile/AgentChat/AgentChatSessionRegistry.swiftSources/PaneMemoryGuardrail.swiftSources/ProcessDetectedResumeIndexes.swiftSources/RestorableAgentSession.swiftSources/RestorableAgentSessionIndex+ProcessCensus.swiftSources/SentryHelper.swiftSources/SharedLiveAgentIndex.swiftSources/SharedLiveAgentIndexLoader.swiftSources/SurfaceResumeBindingIndex.swiftSources/TerminalController+ControlSocketAsync.swiftSources/TerminalController+MemoryDiagnostics.swiftSources/TerminalController+ProcessDiagnostics.swiftSources/TerminalController+ProcessDiagnosticsAsync.swiftSources/TerminalController.swiftSources/TerminalForegroundCommandCapture.swiftSources/VaultAgentProcessScanner.swiftSources/WorkspaceConfigActionCapture.swiftcmux.xcodeproj/project.pbxprojcmuxTests/AgentHibernationProcessSnapshotCoordinatorTests.swiftcmuxTests/AgentNotificationMutationBoundaryTests.swiftcmuxTests/AggregateMemoryRetentionTests.swiftcmuxTests/CmuxTopProcessCPUTests.swiftcmuxTests/CmuxTopProcessSnapshotCaptureCoordinatorTests.swiftcmuxTests/CmuxTopSnapshotScopeCacheTests.swiftcmuxTests/CmuxTopSnapshotScopeTests.swiftcmuxTests/HermesFirstClassSupportTests.swiftcmuxTests/MemoryPressureMonitorTests.swiftcmuxTests/ProcessSnapshotMeasurement.swiftcmuxTests/SyntheticProcessSnapshotReader.swift
💤 Files with no reviewable changes (1)
- Sources/VaultAgentProcessScanner.swift
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Mac fleet instructions for head JOB_JSON=$(~/.local/bin/cmux-ci submit --kind cmux --command 'CMUX_FLEET_BUILD_TAG=pr-13014-5e8f5f59 /Users/Shared/cmux-build-fleet/recipes/cmux.sh https://github.com/manaflow-ai/cmux.git 5e8f5f59d332a7441db96b64a2b76d1080c55a24' --artifact artifacts/cmux.app.zip --workspace https://github.com/manaflow-ai/cmux/pull/13014 --source-digest 5e8f5f59d332a7441db96b64a2b76d1080c55a24 --cache-key cmux:pr-13014 --min-free-bytes 268435456000 --label cmux --label ram48)
JOB_ID=$(python3 -c 'import json,sys; print(json.load(sys.stdin)["id"])' <<<"$JOB_JSON")
~/.local/bin/cmux-ci wait "$JOB_ID" --receipt artifacts/fleet/$JOB_ID.json
~/.local/bin/cmux-ci publish-hq "$JOB_ID"Use an existing campaign job ID if one is already posted; do not submit a duplicate. A wait timeout leaves the remote job running. Published results will include an exact-head artifact link and timing/disk receipt. This recipe validates the macOS app only, not iOS or tests. Never use maclease or put credentials in a PR comment. |
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| do { | ||
| liveCommandsByTTY = try await TerminalForegroundCommandCapture.liveCommands( | ||
| forTTYDevices: Set(ttyDeviceByPanelId.values) | ||
| ) | ||
| } catch { | ||
| return nil | ||
| } |
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An unavailable or incomplete process census makes liveCommands throw, but this catch converts every error to nil. The caller then silently returns, so clicking “Save Workspace Layout” can show neither the dialog nor an error. Propagate the failure so the UI can present a localized retry message instead of dropping the user’s action.
| nonisolated let cmuxProcessSnapshots = ProcessSnapshotService<CmuxTopProcessCapture, CmuxTopProcessFields>( | ||
| capture: { try CmuxTopProcessSampler().capture() }, | ||
| enrich: { try CmuxTopProcessSampler().enrich($0, fields: $1) } | ||
| ) |
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This file introduces a file-scope actor containing shared runtime census state, and the default parameters route all snapshot requests through it. That violates the repository directive against new ambient global runtime state; stateful services must be scoped and injected from an application composition seam. This repository requirement must be satisfied before merging.
Rule Used: Flag new ambient global state in production Swift: a top-level (file-scope) func used as API, a top-level mutable var or a stub class/struct holding a global flag/once-token, a caseless enum/empty struct used purely as a static func/static let namesp... (source)
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| self.handleProcessExit(sessionID: sessionID, pid: pid, retryAttempt: attempt) | ||
| self.processExitRetryTasks[sessionID] = nil |
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When handleProcessExit schedules the next retry, it replaces this dictionary entry. The current task then unconditionally removes that new entry. The successor still runs, but the registry no longer retains its handle, so a later schedule cannot cancel it and concurrent exit handling can start duplicate process scans. Clear the entry only when it still represents the completing attempt.
| Task { | ||
| await presentSaveWorkspaceActionDialog( | ||
| workspace: workspace, | ||
| cmuxConfigStore: cmuxConfigStore, | ||
| window: window | ||
| ) | ||
| } |
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This action starts an unstructured task for the asynchronous snapshot and dialog flow, then immediately discards its handle. The repository requires user-visible asynchronous work with a meaningful lifecycle to be retained and tied to an owner. Repeated actions or window teardown can otherwise leave overlapping work running without cancellation or lifecycle control, so this requirement must be satisfied before merging.
Rule Used: Flag new legacy async patterns in cmux-owned Swift where Swift concurrency is the correct shape: DispatchQueue.global for ordinary async work, new Combine app state, completion-handler APIs fully under cmux control, or fire-and-forget Tasks with mean... (source)
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| localized: "dialog.saveWorkspaceLayout.failedTitle", | ||
| defaultValue: "Couldn't Save Workspace Layout" | ||
| ) | ||
| alert.informativeText = error.localizedDescription |
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The new capture-failure alert displays error.localizedDescription directly. captureConfigActionSnapshot() can propagate ProcessSnapshotError.unavailable, which has no localized user-facing description, so the alert can show untranslated, system-generated implementation text instead of an actionable explanation. This violates the repository requirement that user-facing alert and error text come from the localization catalog, and must be fixed before merging.
Rule Used: Flag production user-facing text that is not fully internationalized across every locale supported by the affected surface: Swift UI/menu/alert/tooltip/error/command text must use String(localized:defaultValue:) or an equivalent localized API with a ... (source)
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| guard !Task.isCancelled, | ||
| refreshCompletionGeneration == session.completionGeneration, | ||
| refreshTask == nil, | ||
| forkAvailabilityRefreshTask == nil else { return false } |
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When a hook-store event arrives during the process census, it can arm deferredReloadTimer without starting a refresh task or advancing refreshCompletionGeneration. This guard does not check that pending state, so it can publish the pre-event cached index and immediately run scheduled hibernation with stale session ownership data.
34ecef4 perf: coalesce concurrent process snapshots across diagnostics and restore (manaflow-ai#13014) 150d7fa Add app-host test failure census (manaflow-ai#13124) 04ac7a4 Merge pull request manaflow-ai#12735 from manaflow-ai/feat-ios-connectivity-soak c022438 fix: update Ghostty environment lifetime fix (manaflow-ai#13191) eb18207 Fix mobile devices dashboard WebSocket failures and naming (manaflow-ai#13156) c7d961d perf: split BrowserPanelView's modifier chain so it type-checks quickly (manaflow-ai#13130) e188035 refactor: move the Computer Use runtime out of the app module into a package (manaflow-ai#13132) cf2b850 Bound terminal markers and verify restored selection 2d7fc1c Measure terminal latency separately after reconnect 44dcd1e Reconcile iOS monitor stack with main 70034bc Merge pull request manaflow-ai#13116 from manaflow-ai/feat-ios-monitor-e2e-repair deafe6e Skip release gate text scans without a probe a1be46b Release terminal ownership from reader teardown 96d6574 Restore transport target after UI evidence 31ff358 Schedule terminal owner cleanup from deinit e82f6f6 Keep bounded terminal text evidence reliable ccbc4b2 Bound frame evidence scans and handshake setup 301dbad Make terminal evidence capture causal 6b50e3a Finish bounded release gate cleanup 14f2cd9 Stop stale release gate probes and bound frame inspection cd64e8c Bound pairing bootstrap loading 035fd37 Harden release gate evidence and readiness b6ca6e9 Close release gate review races 389026e Make release gate readiness and dismissal causal aa2bb02 Restore main translations for the pairing preparation error 46bbfc9 Restore the pairing preparation handling already present on main 1bcbf60 Give the soak one owned terminal reader across steady-state commands 9d700f9 Test soak terminal consumer lifetime across commands and reconnects 1dd9f69 Fix existing Cloud test imports and nested macro compilation bd5fee0 Give launch-request samples a distinct statistics key bc68fbf Measure UI readiness from the actual simulator launch request e5772e8 Test launch request timing across app initialization 8006ba9 Clear prior UI evidence before each retained-simulator launch d8e1b4c Reuse isolated monitor devices while cold-launching the app 0968fcf Test the dedicated monitor simulator plan boundary e7da214 Wait for the published pairing identity and inject screenshot capture 0af38fe Avoid the Swift task-group isolation checker defect in refresh test 48a0eb9 Own UI measurements per launch and capture composited terminal evidence 7e28e4e Mint pairing tickets with the active v2 device identity f498caf Test pairing tickets against the current transport identity 95f931d Correct the foreground suspension entrypoint in the test f5d5b2b Use the public foreground lifecycle for regression-test cleanup 0eded5a End the UI exercise only after terminal consumer ownership is released c0a61bb Keep UI state on its actor across the task-group boundary 30000a5 Drive and measure the real workspace UI before each soak; decouple background discovery 0d896f5 test: foreground refresh must finish while secondary discovery is blocked 4e739bb test: require real UI selection and stable first-frame measurements aeb554a Measure real iOS UI readiness timings (manaflow-ai#12887) 6a2c896 Record per-operation iOS soak latencies (manaflow-ai#12883) 39d7669 test: advertise workspace actions in the soak reconnect fixture 7e9a676 fix: disconnect the soak session before testing reconnect c51a096 test: require stress reconnect to replace a healthy connection e1a2767 fix: import the workspace model from its owning module e6a6ba4 fix: import mobile workspace preview module 3361141 Merge remote-tracking branch 'origin/main' into feat-ios-connectivity-soak dbfebac Merge remote-tracking branch 'origin/main' into feat-ios-connectivity-soak 3f8ceec fix: forward connection snapshots through deferred Iroh transport d8f30dc test: require deferred transports to forward native path snapshots 3dce84c fix: observe soak path and identity on the native RPC connection 38ee330 test: require native connection path evidence throughout soak 055880c test: cover final soak deadline and name failed usage actions b27046c fix: bound stalled soak cycles with an independent deadline 7f1f748 test: require stalled soak operations to report promptly e116e6b Use accepted boolean spelling for the Mac relay setting aa3dc13 Exercise relay setup command arguments in both modes db17d3d Constrain current Iroh endpoints to relays in app gates 245b55e Reproduce release gate missing current Iroh relay policy c9289ed Add focused Iroh soak harness test plan aec8291 Support an isolated agent account for unattended soaks 915c080 Add deterministic iOS Iroh connectivity soak workloads # Conflicts: # .github/workflows/ci.yml # .github/workflows/iroh-v2.yml
…#16141) testSummaryPayloadIncludesPhysicalFootprintMemoryBytes compared the snapshot's memory_bytes with a footprint read taken before the capture. Since #13014 the capture is an async request to the app's shared snapshot service, which may wait behind the host's own census users while the host keeps allocating and freeing. The capture's own footprint read therefore lands some time after that reference. In #15488's validation run the host footprint moved 112 MiB (7 x 16 MiB) in that gap, past the 20% tolerance. The test now reads the footprint again after the capture and requires memory_bytes to be within the same tolerance of the range the two reads span. With no drift the accepted range is unchanged. It also requires memory_source_fallback_pids to be empty, which shows the value came from ri_phys_footprint rather than the resident-size fallback. Refs #15488 Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
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Summary
Concurrent diagnostics, task manager, agent observation, memory sampling, hibernation, restore, and foreground-command capture now share one bounded
ProcessSnapshotServicecensus owner inCmuxFoundation. The owner has at most one active provider and one retained census, supports progressive enrichment on that generation, bounds waiters, and keeps cancellation from starting overlapping scans.Requests declare freshness explicitly: lifecycle callers require a census admitted after the request; diagnostic callers may reuse a census only within their maximum age measured from census start through delivery. Expired, cancelled, unavailable, incomplete, or PID-reused evidence fails closed. Restore and termination paths preserve existing identity and completeness checks. Lightweight callers omit CPU/resource, executable path/argv, and scope enrichment; diagnostics request those fields only when needed. Cross-census scope negatives are no longer retained, so same-PID exec into a cmux-scoped command is visible on the next fresh census.
Evidence and tests
captureCachedwrapper and counts enumeration, BSD topology, task/rusage, path/name, scope, and identity reads. It records CPU time, wall time, and retained allocator blocks/bytes. These are deterministic synthetic measurements, not live incident profiling.The linked live incident values (49.6% CPU, 1,845 enumerator samples, 125 workspaces/427 surfaces) remain issue evidence. No local app was launched and no user session, credentials, or settings were used.
Verification limits
The current Tart focused workflow was blocked by GitHub's Bun API rate limit before checkout/test execution. The tagged reload workflow reached the runner but stopped before compilation because this clone has no registered tag backend origin and the controller/HQ backend helper cannot be used without provisioning. Required Blacksmith CI jobs also failed in runner acquisition/preflight before macOS compilation. These are infrastructure blockers; no passing full app build or live CPU/allocation profile is claimed.
Autoreview policy check is clean. The canonical structured helper produced actionable findings during iteration and those were repaired, but its final reruns stalled in the local Codex subprocess and the wrapper cleanup returned an operation-not-permitted error; therefore the final structured review gate is reported as infrastructure-blocked rather than called clean.
Closes #12983