Fix Codex thread identity resolution

[laulpogan]

Adds the current Codex runtime thread-ID adapter after the existing compatibility adapter, preserving explicit override precedence. Extends hermetic session-key fixtures and records the managed rollout plan.\n\nVerification: focused adapter, lifecycle, 655-home supervisor, relay-down, bilateral local-sister suites; clippy; canonical test-env/run.sh.

Summary by CodeRabbit

• New Features

  • Added support for stable session identity across OpenAI Codex threads.
  • Preserved identity precedence and rejected unexpanded placeholder values.

• Bug Fixes

  • Prevented Codex thread identifiers from leaking into isolated pairing, supervisor, and lifecycle subprocesses.
  • Ensured separate Codex threads receive distinct session contexts.

• Documentation

  • Added design, deployment, verification, and session history documentation for Codex thread identity handling.

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: c63fcc48-2630-4195-8eaa-0e184cf714ea

📥 Commits

Reviewing files that changed from the base of the PR and between 03bfab6 and 2b96e71.

📒 Files selected for processing (9)

• SESSION_LOG_2026_07_18.md
• docs/superpowers/plans/2026-07-18-codex-thread-identity.md
• docs/superpowers/specs/2026-07-18-codex-thread-identity-design.md
• src/cli/pairing.rs
• src/cli/session.rs
• src/session.rs
• test-env/runtime-210.sh
• tests/session_lifecycle.rs
• tests/supervisor_bounded.rs

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📝 Walkthrough

Walkthrough

The change adds CODEX_THREAD_ID as a Codex session identity adapter, updates precedence and hermetic tests, removes the variable from isolated subprocesses, and documents verification, deployment, and removal of the fixed WIRE_SESSION_ID override.

Changes

Codex identity resolution

Layer / File(s)	Summary
Identity contract and rollout plan docs/superpowers/plans/..., docs/superpowers/specs/...	Documents CODEX_THREAD_ID precedence, safety requirements, verification steps, and deployment procedures.
Session-key resolution and validation src/session.rs, test-env/runtime-210.sh	Adds CODEX_THREAD_ID resolution with the codex-cli source label and updates tests for distinct identities, precedence, placeholder rejection, and environment restoration.
Subprocess environment sanitization src/cli/pairing.rs, src/cli/session.rs, tests/session_lifecycle.rs, tests/supervisor_bounded.rs	Removes CODEX_THREAD_ID from isolated Wire and test subprocess environments.
Deployment and verification record SESSION_LOG_2026_07_18.md, docs/superpowers/plans/...	Records merge, installation, service restart scope, measurements, gate results, and the fixed WIRE_SESSION_ID removal plan.

Estimated code review effort: 3 (Moderate) | ~20 minutes

Sequence Diagram(s)

sequenceDiagram
  participant Codex
  participant WireResolver
  participant SessionHome
  Codex->>WireResolver: Set CODEX_THREAD_ID
  WireResolver->>WireResolver: Apply adapter precedence and validation
  WireResolver->>SessionHome: Resolve hashed per-thread session home

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🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly matches the main change: adding and fixing Codex thread identity resolution.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/codex-thread-identity

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