feat(review): add .gittensory.yml review.profile (chill / balanced / assertive)

[JSONbored]

Summary

The first CodeRabbit-parity feature: a .gittensory.yml review.profile knob that lets a maintainer set how nitpicky the AI maintainer-review write-up is.

review:
  profile: chill        # report only blocking defects (bugs/security/breakage); suppress style nits
  # profile: assertive  # also surface minor improvements, style, and nitpicks
  # profile: balanced   # default — reviewer prompt is byte-identical

• Config-only — it lives in manifest.review (the .gittensory.yml config-as-code), so no DB migration / OpenAPI change.
• Presentation only — it shapes how much advisory detail the prose carries; it never changes the gate verdict (the consensus-defect pass runs identically). Absent / balanced appends nothing → the reviewer prompt is byte-identical to today.

Changes

• focus-manifest.ts — ReviewProfile type + profile on FocusManifestReviewConfig; parse (case-insensitive, balanced→null, invalid→warning) + serialize for the cache round-trip.
• ai-review.ts — profile on GittensoryAiReviewInput; buildSystemPrompt appends a chill/assertive tone suffix.
• processors.ts — resolve review.profile from the already-cached manifest at the AI-review call site and thread it in (no extra fetch; the AI-review path makes no new manifest load — verified by the direct-call unit tests).

Closes #1344

Scope

• src/ only — config parse + prompt suffix + threading; no migration/OpenAPI/binding change (ui:openapi:check green)
• No secrets/site/CNAME/lovable; no CHANGELOG

Validation

• npm run test:ci — exit 0; 4305 tests pass
• npm audit --audit-level=moderate — 0 vulnerabilities
• Every changed src line + branch covered (verified via lcov BRDA across focus-manifest.ts, ai-review.ts, processors.ts)
• Tests: parse chill/assertive (case-insensitive), balanced→null + not-present, invalid string/non-string→warning, round-trip; buildSystemPrompt appends CHILL/ASSERTIVE per profile and stays byte-identical when absent

Safety

• Presentation knob only — cannot affect the gate verdict, merge/close disposition, or any public-safe boundary
• Byte-identical default (absent/balanced) — zero behavior change unless a maintainer opts in

[superagent-security]

Superagent didn't find any vulnerabilities or security issues in this PR.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.27%. Comparing base (2e99233) to head (96b39f3).
⚠️ Report is 3 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1347      +/-   ##
==========================================
+ Coverage   95.25%   95.27%   +0.01%     
==========================================
  Files         188      188              
  Lines       20314    20330      +16     
  Branches     7319     7326       +7     
==========================================
+ Hits        19350    19369      +19     
  Misses        378      378              
+ Partials      586      583       -3     

Files with missing lines	Coverage Δ
src/queue/processors.ts	87.57% <100.00%> (+0.02%)	⬆️
src/services/ai-review.ts	97.70% <100.00%> (+0.02%)	⬆️
src/signals/focus-manifest.ts	97.37% <100.00%> (+0.81%)	⬆️

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