chore: complete v1.0 Member Notes System milestone

Archive roadmap and requirements to milestones/v1.0-*.
Evolve PROJECT.md with validated requirements and decisions.
Reorganize ROADMAP.md with milestone grouping.
Delete REQUIREMENTS.md (fresh for next milestone).

Generated with [Claude Code](https://claude.ai/code)
via [Happy](https://happy.engineering)

Co-Authored-By: Claude <noreply@anthropic.com>
Co-Authored-By: Happy <yesreply@happy.engineering>

.planning/MILESTONES.md

@@ -0,0 +1,20 @@
+# Milestones
+
+## v1.0 Member Notes System (Shipped: 2026-02-13)
+
+**Phases completed:** 3 phases, 4 plans
+**Files modified:** 29 | **Lines:** +3,989 / -36
+**Timeline:** 2026-02-13 (single day)
+
+**Key accomplishments:**
+- Polymorphic notes table with Member relationship and author tracking
+- JSON API endpoints for note creation/retrieval with validation and audit logging
+- Inline quick-add note UI on member list with AJAX submission and dark mode
+- Expandable note history panel with search filtering and cache sync
+- 11 feature tests with 86 assertions
+
+**Bug found during UAT:**
+- `<template x-data>` inside `<tbody>` doesn't render children — fixed with per-member `<tbody x-data>`
+
+---
+