docs: migrate project memory governance

.project-docs/60-reflection/skill-candidates.md

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+# Skill Candidates
+
+Track repeated workflow lessons that may deserve a reusable skill, script, or stronger gate.
+
+| Date | Candidate | Evidence | Proposed Action | Status |
+|---|---|---|---|---|
+
+## Promotion Rule
+
+If the same reflection pattern appears repeatedly or prevents a serious mistake, propose a skill update, new skill, script, or deterministic check.