fix: avoid syncing .codex state

[shunkakinoki]

Summary by cubic

Stop syncing the ~/.codex directory in dotfile sync. Removing .codex from DOTDIRS prevents overwriting Nix-managed ~/.codex/config.toml and avoids syncing runtime state (auth, history, sessions) during make switch.

^{Written for commit e389c0a. Summary will update on new commits.}

[coderabbitai]

Caution

Review failed

The pull request is closed.

📝 Walkthrough

Summary by CodeRabbit

• Chores
  • Excluded .codex directory from automatic directory synchronization in build operations.

Walkthrough

The Makefile's DOTDIRS variable was modified to exclude the .codex directory and includes a clarifying comment about runtime state and potential clobbering during make switch operations. This changes the set of dot directories synced by related targets without altering their underlying logic.

Changes

Cohort / File(s)	Summary
Makefile Configuration Makefile	Removed .codex from DOTDIRS variable and added explanatory comment regarding runtime state and potential conflicts during make switch operations.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~5 minutes

Poem

🐰 A codex removed, the Makefile now sings,
.codex excluded from the dot-directory rings,
A comment clarifies what might clobber our way,
Cleaner syncs await when we make-switch each day! 🎯

✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch codex/avoid-codex-dotdir-sync

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[cubic-dev-ai]

No issues found across 1 file

[Copilot]

Pull request overview

This PR updates the dot-directory sync list to avoid syncing Codex’s ~/.codex runtime state into a user’s home directory during the repo’s sync workflow, preventing accidental overwrites of Nix-managed Codex configuration.

Changes:

• Add a Makefile note explaining why .codex/ should not be synced wholesale.
• Remove .codex from DOTDIRS so ruler-dotdirs-sync no longer mirrors it into $HOME.

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