chore: complete v1.2 milestone — archive and tag

Archive v1.2 Modularization & Polish milestone:
- Archive ROADMAP.md, REQUIREMENTS.md, and audit to milestones/
- Evolve PROJECT.md with v1.2 validated requirements and decisions
- Reorganize ROADMAP.md with collapsed milestone groupings
- Delete REQUIREMENTS.md (fresh for next milestone)
- Update STATE.md and MILESTONES.md

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.planning/MILESTONES.md

@@ -1,5 +1,33 @@
 # Project Milestones: Unraid Docker Manager
 
+## v1.2 Modularization & Polish (Shipped: 2026-02-08)
+
+**Delivered:** Modular sub-workflow architecture with "Update All" functionality — 7 domain sub-workflows, bitmap-encoded batch selection, and comprehensive documentation.
+
+**Phases completed:** 10-13 + 10.1, 10.2 (6 phases, 25 plans)
+
+**Key accomplishments:**
+- Decomposed monolithic workflow into 7 domain sub-workflows (Update, Actions, Logs, Batch UI, Status, Confirmation, Matching) — 287 total nodes
+- Bitmap-encoded batch selection eliminating Telegram's 64-byte callback limit (supports 50+ containers)
+- "Update All :latest" via text command and inline keyboard with infrastructure container exclusion
+- Correlation ID tracking for request tracing across sub-workflow boundaries
+- Comprehensive documentation overhaul (README with architecture, configuration, troubleshooting)
+- 9 UAT bugs fixed during Update All verification including infrastructure self-destruction protection
+
+**Stats:**
+- 96 files modified (+51,319/-4,862 lines)
+- 10,987 lines across 8 workflow JSON files
+- 6 phases, 25 plans, 153 commits
+- 4 days (2026-02-04 → 2026-02-08)
+
+**Git range:** v1.1 → `0471565`
+
+**Tech debt accepted:** 4 non-blocking items (descoped logging features, 3 orphan nodes, legacy batch parsers, missing Phase 12 verification)
+
+**What's next:** v2.0 with resource monitoring or proactive notifications.
+
+---
+
 ## v1.1 n8n Integration & Polish (Shipped: 2026-02-04)
 
 **Delivered:** Inline keyboard UX and Docker security hardening — button-driven container control with filtered socket proxy.
@@ -47,6 +75,4 @@
 
 **Git range:** Initial commit → `e5c02f9`
 
-**What's next:** Consider v1.1 with n8n API integration for faster development iteration, or additional features like resource monitoring.
-
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