Integrate runtime hardening and cleanup determinism atomically (#195)

[Niko4417]

Scope

• Accepted issue: Integrate runtime hardening and cleanup determinism atomically #195
• Accepted planning-contract version: v1
• Automated readiness record: Integrate runtime hardening and cleanup determinism atomically #195 (comment)
• Actual source branch: codex/195-atomic-runtime-bridge
• Accepted target branch: epic/98-codex-tracer
• Parent epic and Quality Envelope rows: Epic: Governed Codex lifecycle tracer — one workspace, one no-effect turn #98; runtime protocol/lifecycle correctness; authenticated process cleanup and zero residue; complete native coverage/security/package/platform evidence; linear signed delivery.
• Change classification: hardening
• Product decision, finding, or incident: PR Test fail-closed macOS runtime boundaries (#193) #194 run 31366872754 proved the signed Test: Harden fail-closed macOS runtime boundary paths #193 component could not pass inherited Defect: Make Codex cleanup coverage proof deterministic #101 cleanup tests alone, while Defect: Make Codex cleanup coverage proof deterministic #101 alone could not satisfy the portfolio branch floor. This bridge composes both previously audited components without changing either patch.
• In scope: preserve exact signed Test: Harden fail-closed macOS runtime boundary paths #193 commit 5160de5, apply the complete audited cf870ab..b2a6de7 Defect: Make Codex cleanup coverage proof deterministic #101 aggregate as one signed conflict-free successor, authenticate every contracted patch/tree/binary identifier, and requalify the exact union.
• Out of scope: manual source edits, conflict resolution, merge commits, assertion/deadline/identity/reap/ownership changes, gates or thresholds, workflows, dependencies, UI, Integrated packaged macOS acceptance for the Codex tracer #104, Epic: Contract-as-Code migration and lifecycle activation cutover (ADR-0003/ADR-0004) #49, or unrelated coverage.
• Native targets, contracts, or trust boundaries affected: keiko-host-macos runtime tests and deterministic cleanup reducer/executor. Process identity, signalling, wait/reap, group/owned absence, runtime input, artifact identity, filesystem authority, and evidence provenance remain fail-closed.

Product and architecture alignment

• The implemented contract version and fingerprint match the automated readiness record; no semantic planning change was absorbed during implementation.
• The change follows the Decision Addendum, CONTEXT.md, accepted ADRs, and the issue Quality Plan.
• Existing Keiko material was used only after a recorded Reuse Assessment, or the issue records why Existing Keiko evidence is not applicable.
• This greenfield change creates no mandatory build-time or runtime dependency on Existing Keiko.
• Product authority, policy, evidence, and privileged effects remain in their owning Native layer.
• Any durable architecture change is recorded in an ADR. No durable architecture change was introduced.

Acceptance criteria and evidence

Evidence identifies the exact head or artifact. Remote-only evidence remains explicitly pending.

Acceptance criterion	Evidence	Exact head or artifact	Result
AC1 — exact two-commit signed composition	Ancestry count 2; HEAD^=5160de5; tree bb59529d; successor patch ac0949d5; union patch f304be57; union binary c1fdd583; one runtime.rs delta; signatures good/private	d82694e	Pass
AC2 — combined persisted coverage and semantic preservation	Bridge-owned llvm-cov JSON; workspace 1140/1332 branches = 85.5856%; runtime.rs 748/876 = 85.3881%; +33 covered/+8 denominator; 27 newly covered #193 production directions; all #101 reducer functions/regions executed	sha256:565226dc80d4295cc5bf88ef4fcb46f0b036adea00a6d7db789ee1302ded33bf	Pass
AC3 — focused tests, host x3, coverage x3, zero residue	#193 focused 11/11; #101 focused 24/24; host 193/193 three sequential passes; native:coverage three sequential passes; final residue scan empty	d82694e	Pass
AC4 — complete local quality envelope	npm ci, quality, audit high, package/platform/security/signing/native gates, and acceptance:macos green; SHA-bound verify and findings-zero audit receipts written	d82694e	Pass
AC5 — authoritative remote and review settlement	Fresh exact-head macOS 14 job 93414762215 and macOS 26 job 93414762291 are green; thread-aware review quiet and final child eligibility remain pending	d82694e	Remote pass; review pending

Acceptance journey evidence

• Applicability: Not applicable — this is a non-user-facing atomic integration and verification slice. It changes no user-visible behavior; Epic Epic: Governed Codex lifecycle tracer — one workspace, one no-effect turn #98 and final child Integrated packaged macOS acceptance for the Codex tracer #104 retain the packaged Acceptance Journey.

• Automated checks exercise user-visible outcomes rather than incidental implementation details. Not applicable to this non-user-facing bridge; semantic runtime outcomes were exercised.

• Required failure, recovery, accessibility, visual, and platform observations are settled. Journey-specific accessibility, visual, and manual observations are not applicable.

Quality Plan settlement

• Applicable positive, negative, boundary, failure, cancellation, and recovery behavior is covered.
• The actually wired production composition was tested where this change crosses layers.
• Applicable security, accessibility, performance, resource, visual, and platform evidence is attached or settled by accepted exclusions. Exact-head macOS 14 job 93414762215 and macOS 26 job 93414762291 are green.
• Excluded quality areas retain the rationale accepted in the issue: accessibility, visual, manual, and Windows evidence is not applicable.
• Secrets, credentials, raw customer content, private endpoints, and PII are absent from source, tests, logs, evidence, artifacts, issues, and this pull request.

Verification

• npm ci --ignore-scripts
• npm run quality
• npm audit --audit-level=high
• Every declared native target-specific gate passed on its authoritative platform. Local macOS arm64 and exact-head remote macOS 14/26 are green.
• I reviewed the complete diff against requirements, contracts, trust boundaries, and failure modes.

Additional affected checks and concise results:

Exact head: d82694e8bb4fd2d8e7b276bbc3a7b5a33cb692e0
Host library suite: 193/193 x3 sequential, no retry
Native coverage wrapper: x3 sequential, no retry
Bridge report: 1140/1332 workspace branches (85.5856%)
Full quality: green, including control/native format, lint, architecture, build,
coverage, package, platform, security, signing, and tests
npm audit --audit-level=high: 0 vulnerabilities
npm run acceptance:macos: green (frontend 56/56; host 193/193)
Runner verify receipt: issue 195 / exact head / green
Runner audit receipt: issue 195 / exact head / findings=0 / user_facing=false

Independent audit and findings

• Audit scope and dimensions: exact ancestry/patch identity/signatures; byte-level union only; Test: Harden fail-closed macOS runtime boundary paths #193 coordinate preservation; Defect: Make Codex cleanup coverage proof deterministic #101 reducer/executor and cleanup semantics; identity/reap/absence/ownership trust boundaries; combined report; hermetic teardown and residue; exact-head local gates.
• Audited commit: d82694e

Confirmed finding	Evidence	Disposition	Settlement evidence or follow-up
None	Independent composition, source, report, and final local-gate audits	Findings = 0	SHA-bound audit receipt for issue 195

• Findings are evidence-cited; speculative observations are advisory rather than blockers.
• Every confirmed finding is resolved, explicitly accepted by an authorized human, or linked to a scoped follow-up that does not invalidate current acceptance.
• Verification and audit were repeated after the latest implementation or audit fix.

Integrated epic acceptance

• Applicability: Not applicable — this child atomically supplies the authenticated runtime bridge to Epic Epic: Governed Codex lifecycle tracer — one workspace, one no-effect turn #98; final integrated packaged acceptance remains owned by Integrated packaged macOS acceptance for the Codex tracer #104.
• Production-composition result: Not applicable as final epic acceptance; the exact combined runtime source and local package path are green.
• Machine-enforced acceptance result: Not applicable as final epic acceptance; Integrate runtime hardening and cleanup determinism atomically #195 local contract and quality gates are green.
• macOS evidence: Integrate runtime hardening and cleanup determinism atomically #195 local macOS arm64 green; final Epic Epic: Governed Codex lifecycle tracer — one workspace, one no-effect turn #98 packaged evidence remains Integrated packaged macOS acceptance for the Codex tracer #104-owned.
• Windows evidence: Not applicable under ADR-0006.
• Manual usability, accessibility, visual, signing, or packaging evidence: usability/a11y/visual/manual not applicable; local signing and packaging gates green.

Delivery

• Target path: child issue -> epic branch
• The target branch matches the delivery path accepted in the issue; no direct push, force push, gate bypass, finding dismissal, or authority widening occurred.
• Commits are signed and every required check is bound to the exact current head and expected producer; remote-only checks remain explicitly pending rather than claimed complete.
• Advisory tools are not treated as required merge authority under the current quality-gate policy.
• Documentation, ADRs, contracts, known limitations, and follow-ups are current.
• A draft pull request was not promoted to Ready for Human Review before every required Acceptance Journey result and exact-head gate was complete.

For a child-issue pull request targeting its designated epic branch:

• The accepted issue authorizes this epic-branch target.
• Acceptance and audit evidence is complete, every applicable exact-head gate is green, and no blocking finding or review conversation remains. Local and remote gates are green; the sole @codex review request has zero reviews, conversations, or actionable threads after the quiet interval.

This authority exists only for a fully eligible child-issue pull request targeting its exact accepted epic/** branch. Epic and standalone pull requests remain human-only deliveries to dev. For this child delivery, no merge, auto-merge, enqueue, target update, or guarded operation is requested by this draft PR. Any later guarded child merge must revalidate the exact issue, contract, readiness, PR, head, target/base, request identity, checks, findings, conversations, and target serialization; it must submit the exact revalidated head with squash semantics. Guard unavailability selects human-only child integration.

For an epic or standalone pull request targeting dev, complete only by Niko or Oscharko. This subsection is not applicable to this child PR and remains untouched for automation purposes.

• Authorized maintainer: Not applicable — child PR targets the epic integration branch.
• Reviewed head commit: Not applicable — dev-merge subsection is not used for this child PR.
• I reviewed the linked issue and pull request, including scope, acceptance criteria, Quality Plan, evidence, checks, findings, conversations, and residual risks on the commit above.
• I am manually initiating the merge into dev; no automated actor is performing it.

Residual risks and follow-ups

• Remote exact-head evidence passed: macOS 14 job 93414762215 and macOS 26 job 93414762291.
• Review settlement: one @codex review request was posted; the current thread-aware fetch reports zero reviews, conversations, or actionable findings.
• Final child attestation: exact-head remote, local, audit, and current zero-conversation evidence is complete; guarded merge authority remains separately revalidated.
• Downstream Epic Epic: Governed Codex lifecycle tracer — one workspace, one no-effect turn #98 packaged Acceptance Journey remains owned by Integrated packaged macOS acceptance for the Codex tracer #104.

[Niko4417]

@codex review

[Niko4417]

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. What shall we delve into next?

Reviewed commit: d82694e8bb

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