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update_skill(): writes new Skill content to skills/<skill_id>/SKILL.md and commits it (03-C §3.8: file write + git commit must be atomic -- the DB insert only happens after the commit succeeds, so a git failure naturally leaves no orphaned skill_iteration row, no separate rollback machinery needed), rejects a missing triggered_by_bug_id (MISSING_TRIGGER_REF). rollback_skill(): restores the pre-iteration content from before_git_commit_sha and commits *that* as a new commit + new skill_iteration row (03-C §3.9: rollback is itself a new iteration, not a history rewrite); the rollback record's triggered_by_bug_id reuses the original iteration's, since c_skill_rollback's input contract has no bug_id of its own and that FK is NOT NULL. repo_path has no default (caught and fixed during this Unit, not shipped with the bug): an earlier draft defaulted it to this repo's own root, which would have made any test that forgot to override it silently commit into graphlemon's actual git history. Every call site must now be explicit; git log confirms nothing leaked into this repo while building and testing it. Resolves U-015's deferred skill_defect gap: re-reading 04-P §4.3's own transition table, bug_recorded (c_bug_record_create alone) and skill_iteration_triggered (-> c_skill_update) are separate, sequential transitions, not one atomic call -- so 03-C §3.10's "必须同时创建 skill_iteration_suggestion" is a same-flow requirement, not a same-API-call one. bug_record.py already accepted skill_defect (it was never actually rejected, just undocumented as resolved); update_skill() now fills in bug_record.skill_iteration_suggestion_id once the real iteration exists. Known gap, not this Unit's job: no real Skill content has been migrated from the Hermes profiles yet (05 §5.1 names the skills; agent_profile.py's frontmatter only references them by name) -- tests seed a placeholder skill file, same pattern as U-010/011 seeding placeholder artifacts for upstream producers that don't exist yet. 10 new stdlib unittest cases, all real (git + sqlite, no LLM call needed -- same category as U-013's worktree tests). 167 total across U-001-018, all passing. This closes PH2-S2. REQ-08 is now real code, and U-015's skill_defect note is resolved rather than left permanently deferred. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
