chore: Codex AGENTS.md and Gemini Code Assist config (mention-only)

[r-uben]

Summary

Prepares the repo for mention-only advisory reviewers on GitHub:

• Codex GitHub Code Review reads root AGENTS.md (## Code Review Rules with ### items).
• Gemini Code Assist reads .gemini/config.yaml and .gemini/styleguide.md.

gitty triggers @codex review or /gemini review when it wants a second opinion. Neither bot auto-reviews every PR.

Changes

File	Purpose
AGENTS.md	Codex review rules distilled from CLAUDE.md / .codex/agents/socr-reviewer.toml
.gemini/config.yaml	code_review.disable: false, auto review off on PR open (pull_request_opened.code_review/summary/help: false), comment_severity_threshold: HIGH
.gemini/styleguide.md	Same durable checks in Gemini style-guide voice
.gitignore	Allowlist AGENTS.md and .gemini/styleguide.md (repo ignores *.md by default)

Out of scope (by design)

• No product code, tests, or CI workflow changes
• No gemini.yml GitHub Actions workflow
• No Codex GitHub App install files (connected in ChatGPT UI)

Verification

• AGENTS.md has five ### rules under ## Code Review Rules
• .gemini/config.yaml YAML parses; pull_request_opened.code_review: false
• Diff is docs/config only

  

---

Summary by cubic

Adds mention-only advisory reviewer configs for Codex (AGENTS.md) and Gemini Code Assist (.gemini/config.yaml, .gemini/styleguide.md), and updates .gitignore so these files are tracked. Reviewers trigger only via @codex review or /gemini review; auto-review on PR open stays off.

^{Written for commit b846c02. Summary will update on new commits.}

[coderabbitai]

Important

Draft PR not reviewed

Draft PRs are not automatically reviewed by default.

• Trigger a manual review

To automatically review draft PRs, update your CodeRabbit configuration:

reviews:
  auto_review:
    drafts: true

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[chatgpt-codex-connector]

To use Codex here, create an environment for this repo.

[r-uben]

MERGE

Docs/config only. AGENTS.md has ## Code Review Rules with five ### items (silent data loss, real-caller tests, resume allowlists, local VLM identity, leave format to CI). .gemini/config.yaml keeps code_review.disable: false and turns off auto review/summary/help on PR open — mention-only once GCP is connected. .gitignore allowlists AGENTS.md and .gemini/styleguide.md (repo ignores *.md by default; without that the files would not ship). No product/CI/workflow changes. No gemini.yml.

Soft: CLAUDE.md still does not mention the cheat-sheet; fine for this PR. Do not merge unless Rubén asks.

[r-uben]

/gemini review

Smoke test from gitty: mention-only second opinion on this docs/config PR (AGENTS.md + .gemini/ mention-only). If you are listening, a short review is enough.

[r-uben]

@codex review

Smoke test from gitty: mention-only second opinion on this docs/config PR (AGENTS.md + .gemini/ mention-only). Short review is enough.

[chatgpt-codex-connector]

Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-02T23:31:11.376335Z	b846c02	Manual request

ℹ️ About Codex in GitHub

Your team has set up Codex to review pull requests in this repo. Reviews are triggered when you

• Open a pull request for review
• Mark a draft as ready
• Comment "@codex review" or "@codex security review".

Codex reacts with 👀 while any review is running, comments if it has suggestions, and reacts with 👍 once all reviews finish with no findings.

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. More of your lovely PRs please.

Reviewed commit: b846c02ce9

ℹ️ About Codex in GitHub

Your team has set up Codex to review pull requests in this repo. Reviews are triggered when you

• Open a pull request for review
• Mark a draft as ready
• Comment "@codex review".

If Codex has suggestions, it will comment; otherwise it will react with 👍.

Codex can also answer questions or update the PR. Try commenting "@codex address that feedback".