feat: add EventRelay Gemini analysis command

[groupthinking]

Canonical issue

Closes #2416

Outcome

Adds a repository-owned Gemini CLI extension with /analyze-code, the official slash-command form of the requested @analyze-code concept. The command performs bounded, read-only EventRelay analysis across architecture, correctness, performance, security, and test gaps while preserving the repository's locked facts and evidence boundaries.

Scope

• Included: extension manifest and context; /analyze-code TOML prompt; local usage documentation; a narrow .gitignore exception for this extension; focused manifest, safety, repository-invariant, analysis-dimension, measurement, documentation, and example-path contracts.
• Explicitly excluded: /generate-tests, /verify-change, application/runtime changes, dependencies, model calls, production requests, deployments, and user-global Gemini configuration changes.

Risk

• Risk level: low
• Failure mode: Gemini CLI format drift or an underspecified prompt could hide the command or produce analysis that exceeds the requested scope.
• Rollback: revert this pull request; no runtime migration or production state is involved.

Verification

Exact head: 0985db9ace34911556fe0808c5ccde9bb8fb84d7

• python3 -m unittest -v tests.unit.test_eventrelay_gemini_extension — 8 passed.
• gemini extensions validate .gemini/extensions/eventrelay-engineering — passed with Gemini CLI 0.46.0.
• Fresh isolated temporary Gemini home — exact-head extension linked successfully and listed enabled at version 0.1.0.
• git diff --check — passed; GitHub reports six expected files and 285 additions.
• Exact-head CI, Coverage, Security Scan, CodeQL Analysis, Secret Scan, E2E Tests, Dependency Review, Require issue closer, and Auto Label — passed. Dependabot Auto Merge was skipped as not applicable.
• Review threads resolved — the sole documented-path finding was fixed by 0985db9ace34911556fe0808c5ccde9bb8fb84d7; zero unresolved threads remain.

Production evidence

Not applicable. This is repository developer tooling and changes no application or deployment path. No Gemini model call was made, so prompt-output quality is not presented as runtime proof; current evidence covers manifest validity, exact-head isolated installation, command-contract content, and repository checks. No user-global installation is claimed.

Agent handoff

• One canonical issue is linked.
• Fresh GitHub search found no competing issue or implementing PR.
• Issue feat: add repository-aware Gemini /analyze-code command #2416 acceptance criteria are satisfied by the exact head.
• Required checks pass on the current head.
• Human decision is requested only for product, security, irreversible infrastructure, or production approval.

[coderabbitai]

Important

• 🔍 Trigger review

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⚙️ Run configuration

• Configuration used: Repository: groupthinking/EventRelay/.coderabbit.yaml
• Review profile: ASSERTIVE
• Plan: Advanced
• Run ID: d2c604f9-46f9-43b1-946c-a70ab23ce691

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[Copilot]

🟡 Changes recommended

The documented file-scope example points to a nonexistent repository path and will not analyze the intended service.

1 open finding

• Correct documented invocation to use the repository-relative service path · New

What changed in this PR

Adds a repository-owned Gemini CLI /analyze-code extension for bounded, read-only EventRelay analysis.

Changes:

• Adds the extension manifest, context, and analysis prompt.
• Documents local validation and usage.
• Adds contract tests and scoped .gitignore exceptions.

File	Description
.gitignore	Tracks the repository extension while ignoring other local extensions.
.gemini/​extensions/​eventrelay-engineering/​README.md	Documents installation and invocation.
.gemini/​extensions/​eventrelay-engineering/​GEMINI.md	Defines repository-specific context and constraints.
.gemini/​extensions/​eventrelay-engineering/​gemini-extension.json	Declares extension metadata.
.gemini/​extensions/​eventrelay-engineering/​commands/​analyze-code.toml	Implements the read-only analysis command.
tests/​unit/​test_eventrelay_gemini_extension.py	Verifies manifest, safety, scope, and output contracts.

🧠 Review effort: Balanced

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[linear-code]

GRV-816

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Project	Deployment	Actions	Updated
v0-uvai	Ready	Preview, v0	Oct 12, 2026 5:26pm UTC