feat(skills): rewrite code-review skill with sharded step-file architecture
Replace monolithic XML-step workflow with 4 sharded step files:
- step-01: gather context (diff source, spec, chunking)
- step-02: parallel review (blind hunter, edge case, acceptance auditor)
- step-03: triage (normalize, deduplicate, classify into 5 buckets)
- step-04: present (categorized findings with recommendations)
Key changes:
- Three parallel review layers via subagent invocation
- Structured triage with intent_gap/bad_spec/patch/defer/reject categories
- Works with or without a spec file
- Loopbacks are recommendations, not automated re-runs
- Remove checklist.md (superseded by triage step)
- Remove discover-inputs.md (no longer referenced)
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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