chore: dogfood init — add CI adoption files to the repo

[bntvllnt]

Dogfoods the init command shipped in #34, verified against the published canary 2.3.0-canary.8cfac95.

Running codebase-intelligence@canary init . on this repo generated the agent-adoption files. The repo now practices what it ships — AI agents working here are told to query codebase-intelligence before grep/read.

Files

• AGENTS.md, CLAUDE.md — managed instruction block appended (existing content untouched)
• GEMINI.md, CONVENTIONS.md, .cursor/rules/codebase-intelligence.mdc, .github/copilot-instructions.md — new

Pure additions (151 insertions, 0 deletions). Docs/agent files only — no src/** change, so this does not trigger a canary publish on merge.

Verification

init from the published canary: 6 files written, pre-existing content preserved, re-run fully idempotent, skill install confirmed (temp HOME). End-to-end pipeline (merge → OIDC canary publish → npx @canary → init) works.

[bntvllnt]

Review — 0 findings (0 blocking, 0 warn)

BLOCKING

None.

WARN

None.

VERIFIED CLEAN

• Reviewed all changed files at head e352f773707d74246b11cd970a1e80a8917b69c1: .cursor/rules/codebase-intelligence.mdc, .github/copilot-instructions.md, AGENTS.md, CLAUDE.md, CONVENTIONS.md, GEMINI.md.
• The PR is bounded to repo/agent instruction adoption files only; no src/**, package metadata, release, or runtime behavior changes are included.
• The inserted managed blocks match the single source of truth in src/install/index.ts#renderBlock, preserve existing AGENTS.md / CLAUDE.md content, and use valid CLI commands present in src/cli.ts.
• The additions align with the VLLNT Platform dogfood objective: this repo now consumes the init adoption layer it ships, without adding internal/private operational details.
• Manual approval recommended. Per reviewer policy, I am not submitting an autonomous APPROVE.

VALIDATION

• Live PR state re-fetched immediately before review: open, non-draft, base main, head e352f773707d74246b11cd970a1e80a8917b69c1, mergeStateStatus=CLEAN, mergeable=MERGEABLE, no prior reviews/comments observed.
• GitHub checks observed: Quality Gates (18) pass; Quality Gates (22) pass.
• Ran locally after pnpm install --frozen-lockfile:
  • git diff --check origin/main...HEAD — pass
  • pnpm lint — pass
  • pnpm typecheck — pass
  • pnpm build — pass
  • pnpm test — pass: 17 files, 310 passed, 3 todo
• Ran built CLI smoke/idempotency check: node dist/cli.js init <temp-repo> --no-skill --json created/updated the six target files on first run, reported all six unchanged on second run, preserved pre-existing AGENTS.md content.