Skip Codex Utilities prefixes for projectless chats

[gaelic-ghost]

Summary

• skip title prefix planning for projectless Codex chat directories by default
• add an opt-in CODEX_UTILITIES_PROJECTLESS_THREAD_PREFIX override for labels like Chat
• document the live SessionStart payload shape from the trusted plugin hook test

Verification

• direct dry-run smoke tests for projectless default, projectless Chat override, and workspace paths
• uv run scripts/validate_socket_metadata.py

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: d54d0e55-05fc-4274-b30a-de1fa361adb8

📥 Commits

Reviewing files that changed from the base of the PR and between 45210b2 and c1ecdf6.

📒 Files selected for processing (2)

• plugins/codex-utilities/docs/thread-title-hooks.md
• plugins/codex-utilities/scripts/session-start-hook.mjs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch plugin/codex-utilities-projectless-title-policy

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