Restore lab.5 release Rust test convergence

[shiny-code-bot]

Objective

Restore the full Rust release-test contract after upstream convergence so codex-lab-v0.1.0-lab.5 can be rehearsed and published from an exact green main commit without suppressing failures or restoring obsolete V1 behavior.

Finish Line

A validation-only codex-lab-release run passes argument-comment lint, all four macOS nextest shards, aggregate Rust CI, full release verification, signed artifact construction, and release preconditions from one immutable main SHA. The surviving tests and snapshots describe the intended Every Code product contract, and removed expectations are documented as deliberate convergence rather than hidden.

Current Status

• Release repairs are merged on current immutable main@7e41b506e2049a7fb270d72ca832d0d649520e05: Preserve standalone bounded world-state fragments #724 context layout, Stabilize release SDK integration tests #725 SDK integration, Fix release argument-comment lint #726 argument-comment lint, and Fix bounded Cursor project path decoding #728 bounded Cur discovery. Each PR completed with 17/17 checks green.
• Fix Cur session discovery and external-config imports #710 closed after restoring all five owned failures: 28/28 Cur-focused tests and the dependent app-server import passed locally; final Opus review approved.
• The previous exact run 32079083468 on dfef469593966997a6eb10a5eee7412b6c9109f3 had 79 Rust failures owned as Clear lab.5 release harness portability failures #706 (1), Restore compaction, model-switch, and prompt-cache invariants #709 (13), Fix Cur session discovery and external-config imports #710 (5), Reconcile CLI, remote-control, MCP, and WebSocket contracts #711 (14), Repair execution auth, resume, thread, and safety persistence #712 (29), and Reconcile approval, permission, skill, and tool contracts #713 (17), plus SDK and argument-comment gates now repaired.
• Fresh validation-only codex-lab-release run 32088615145 was dispatched August 18, 2026 from exact main@7e41b506e2049a7fb270d72ca832d0d649520e05 with publish=false for codex-lab-v0.1.0-lab.5.
• Next action: wait for 32088615145, preserve complete artifacts/logs, verify the SDK and argument-comment hard gates remain green, and reclassify only the residual Rust failures before promoting the next bounded lane.

Acceptance Criteria

• Argument-comment lint passes on the exact release target set.
• Local and remote exec-server CLI paths preserve --concurrent-requests and forward the selected dispatch mode.
• V8 tests express the current sandbox-enabled product invariant without requiring nonexistent public artifacts.
• Mandatory-MultiAgentV2 core tests and model-visible context snapshots are reconciled without restoring V1 runtime behavior.
• CLI, app-server, MCP, external-agent, proxy, and protocol tests are reconciled to intended product contracts.
• Stale snapshots are reviewed and accepted only after their owning behavior is classified.
• Focused Cargo and Bazel gates pass for every staged repair.
• A fresh validation-only codex-lab-release run is fully green from one exact main SHA.

Relationships

• Sub-issue of Publish and prove Codex Lab lab.5 #624.
• Follow-up to Make release Rust test shards self-contained and trustworthy #668, which made release shards self-contained and exposed these product/test failures.
• Related to Migrate the core test corpus to mandatory MultiAgentV2 #545 mandatory MultiAgentV2 test migration and Detect code-present-but-unreachable regressions during upstream convergence #664 convergence reachability prevention.
• Release blocker before publication and before Sync Codex Lab with current openai/codex substrate #230 becomes the exclusive post-release engineering lane.
• related: Make release Rust test shards self-contained and trustworthy #668 - Make release Rust test shards self-contained and trustworthy #668
• related: Migrate the core test corpus to mandatory MultiAgentV2 #545 - Migrate the core test corpus to mandatory MultiAgentV2 #545
• related: Detect code-present-but-unreachable regressions during upstream convergence #664 - Detect code-present-but-unreachable regressions during upstream convergence #664

Decisions

• Do not add broad lint/test suppressions.
• Do not restore obsolete MultiAgentV1 runtime paths.
• Prefer production behavior restoration when an owned test proves a lost Every Code edge; update/remove tests only when the old expectation is explicitly obsolete.
• Keep each implementation PR independently reviewable and normally under 500 changed lines for complex logic.