docs: update README and CLAUDE.md with complete feature documentation

[SimonOyaneder]

Summary

• Update test count from 101 to 292 (26 suites) to reflect current state
• Document all comment commands (/canon init, /canon index, /canon reset) that were missing from README
• Add missing environment variables to the README table (MAX_REVIEW_ROUNDS, MAX_REPO_FILES, MAX_PROMPT_TOKENS, RETRY_MAX_ATTEMPTS, RETRY_BASE_DELAY_MS, EMBEDDING_DIMENSIONS)
• Document push event handler for incremental indexing
• Add Docker Compose setup instructions and production deployment notes (PRIVATE_KEY vs PRIVATE_KEY_PATH)
• Document integration tests with testcontainers
• Update architecture diagram to include push events
• Update file structure to include all files (review-counts.ts, content-cache.ts, openai-models.ts, openai-runner.ts, retry.ts, init-handler.ts, push-handler.ts)
• Update CLAUDE.md with push handler, retry logic, review rounds, content cache, and /canon reset command

Test plan

• Verify all documented env vars match src/config/index.ts
• Verify all documented commands match src/github/comment-handler.ts
• Verify file structure matches actual src/ directory
• Run npm test to confirm test count matches (292)

🤖 Generated with Claude Code

[canon-review]

Found 1 pattern deviations: 🟡 1 medium

[canon-review]

🟡 Pattern Violation · medium · confidence: 99%

Section says "Three entry points" but lists six triggers, which breaks the repository’s documentation consistency pattern of accurate event summaries.

Existing pattern: Event summaries match the actual routed handlers and enumerate all trigger types accurately.
Reference: src/index.ts

Suggested change

	Three entry points:
	Three event types (with multiple commands on issue comments):

[SimonOyaneder]

/canon review

[canon-review]

Reviewed this PR and found no pattern deviations. The code follows existing repository conventions. ✅

[SimonOyaneder]

/canon review

[canon-review]

Found 1 pattern deviations: ⚪ 1 low

[SimonOyaneder]

/canon review