directory changes and restructuring

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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

official-skills/notion-spec-to-implementation/reference/milestone-summary-template.md

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+# Milestone Summary Template
+
+Use this when completing major phases or milestones.
+
+```markdown
+## Phase [N] Complete: [Date]
+
+### Accomplishments
+- [Major item delivered]
+- [Major item delivered]
+
+### Deliverables
+- <mention-page url="...">Deliverable 1</mention-page>
+- [Link to PR/deployment]
+
+### Metrics
+- [Relevant metric]
+- [Relevant metric]
+
+### Learnings
+- [What went well]
+- [What to improve]
+
+### Next Phase
+Starting [Phase name] on [Date]
+```
+