chore: archive v1.2 Collection Power-Ups milestone

Archive roadmap and requirements to milestones/, evolve PROJECT.md
with validated requirements, update retrospective, and reorganize
ROADMAP.md with milestone groupings.

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

.planning/milestones/v1.2-REQUIREMENTS.md

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+# Requirements Archive: v1.2 Collection Power-Ups
+
+**Archived:** 2026-03-16
+**Status:** SHIPPED
+
+For current requirements, see `.planning/REQUIREMENTS.md`.
+
+---
+
+# Requirements: GearBox v1.2 Collection Power-Ups
+
+**Defined:** 2026-03-16
+**Core Value:** Make it effortless to manage gear and plan new purchases -- see how a potential buy affects your total setup weight and cost before committing.
+
+## v1.2 Requirements
+
+Requirements for this milestone. Each maps to roadmap phases.
+
+### Search & Filter
+
+- [x] **SRCH-01**: User can search items by name with instant filtering as they type
+- [x] **SRCH-02**: User can filter collection items by category via dropdown
+- [x] **SRCH-03**: User can combine text search with category filter simultaneously
+- [x] **SRCH-04**: User can see result count when filters are active (e.g., "showing 12 of 47 items")
+- [x] **SRCH-05**: User can clear all active filters with one action
+
+### Weight Units
+
+- [x] **UNIT-01**: User can select preferred weight unit (g, oz, lb, kg) from settings
+- [x] **UNIT-02**: All weight displays across the app reflect the selected unit
+- [x] **UNIT-03**: Weight unit preference persists across sessions
+
+### Weight Classification
+
+- [x] **CLAS-01**: User can classify each item within a setup as base weight, worn, or consumable
+- [x] **CLAS-02**: Setup totals display base weight, worn weight, consumable weight, and total separately
+- [x] **CLAS-03**: Items default to "base weight" classification when added to a setup
+- [x] **CLAS-04**: Same item can have different classifications in different setups
+
+### Weight Visualization
+
+- [x] **VIZZ-01**: User can view a donut chart showing weight distribution by category in a setup
+- [x] **VIZZ-02**: User can toggle chart between category view and classification view (base/worn/consumable)
+- [x] **VIZZ-03**: User can hover chart segments to see category name, weight, and percentage
+
+### Candidate Status
+
+- [x] **CAND-01**: Each candidate displays a status badge (researching, ordered, or arrived)
+- [x] **CAND-02**: User can change a candidate's status via click interaction
+- [x] **CAND-03**: New candidates default to "researching" status
+
+### Planning UI
+
+- [x] **PLAN-01**: Planning category filter dropdown shows Lucide icons alongside category names
+
+## Future Requirements
+
+Deferred to future milestones. Tracked but not in current roadmap.
+
+### Planning Enhancements
+
+- **COMP-01**: User can compare candidates side-by-side on weight and price
+- **RANK-01**: User can rank/prioritize candidates within a thread
+- **IMPC-01**: User can preview how a candidate affects setup weight/cost before resolving
+
+### Data Management
+
+- **DATA-01**: User can import gear collection from CSV
+- **DATA-02**: User can export gear collection to CSV
+
+### Social & Multi-User
+
+- **SOCL-01**: User can create an account with authentication
+- **SOCL-02**: User can share collections and setups publicly
+- **SOCL-03**: User can view other users' public profiles and setups
+
+### Automation
+
+- **AUTO-01**: System can auto-fill product information (price, weight, images) from external sources
+
+## Out of Scope
+
+Explicitly excluded. Documented to prevent scope creep.
+
+| Feature | Reason |
+|---------|--------|
+| Per-item weight input in multiple units | Parsing complexity, ambiguous storage -- display-only conversion is sufficient |
+| Interactive chart drill-down (click to zoom) | Adds significant interaction complexity for minimal value |
+| Weight goals / targets | Opinionated norms conflict with hobby-agnostic design |
+| Custom classification labels | base/worn/consumable covers 95% of use cases |
+| Server-side full-text search | Premature for single-user app with <1000 items |
+| Classification at item level (not setup level) | Same item has different roles in different setups |
+| Status change timestamps | Useful but adds schema complexity -- defer |
+
+## Traceability
+
+Which phases cover which requirements. Updated during roadmap creation.
+
+| Requirement | Phase | Status |
+|-------------|-------|--------|
+| SRCH-01 | Phase 8 | Complete |
+| SRCH-02 | Phase 8 | Complete |
+| SRCH-03 | Phase 8 | Complete |
+| SRCH-04 | Phase 8 | Complete |
+| SRCH-05 | Phase 8 | Complete |
+| UNIT-01 | Phase 7 | Complete |
+| UNIT-02 | Phase 7 | Complete |
+| UNIT-03 | Phase 7 | Complete |
+| CLAS-01 | Phase 9 | Complete |
+| CLAS-02 | Phase 9 | Complete |
+| CLAS-03 | Phase 9 | Complete |
+| CLAS-04 | Phase 9 | Complete |
+| VIZZ-01 | Phase 9 | Complete |
+| VIZZ-02 | Phase 9 | Complete |
+| VIZZ-03 | Phase 9 | Complete |
+| CAND-01 | Phase 8 | Complete |
+| CAND-02 | Phase 8 | Complete |
+| CAND-03 | Phase 8 | Complete |
+| PLAN-01 | Phase 8 | Complete |
+
+**Coverage:**
+- v1.2 requirements: 19 total
+- Mapped to phases: 19
+- Unmapped: 0
+
+---
+*Requirements defined: 2026-03-16*
+*Last updated: 2026-03-16 after roadmap creation*