chore: restore original directory structure (project under code-review-graph-main/)

code-review-graph-main/skills/unified-review/references/specialists/maintainability.md

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+# Maintainability Specialist
+
+Focus: code quality and maintainability issues.
+
+- [ ] Dead code / unreachable branches / unused variables
+- [ ] Magic numbers → named constants
+- [ ] Overcomplicated abstractions (indirection without payoff)
+- [ ] Copy-paste blocks that should be shared (only when it aids clarity)
+- [ ] Functions too large / doing too much
+- [ ] Stale comments contradicting the code
+
+Suppress: harmless redundancy that aids readability, comment-on-threshold
+requests, consistency-only changes.
+
+Output JSON lines:
+`{"severity":"CRITICAL|INFORMATIONAL","confidence":N,"path":"file","line":N,"category":"maintainability","summary":"...","fix":"...","source":"maintainability"}`