docs(18-01): complete schema foundations plan

- Create 18-01-SUMMARY.md with execution results
- Update STATE.md with phase 18 position and decisions
- Update ROADMAP.md with phase 18 progress (1/5 plans)
- Mark GLOB-01, GLOB-02, PROF-01, PROF-03 requirements complete

.planning/phases/18-global-items-public-profiles/18-01-SUMMARY.md

@@ -0,0 +1,104 @@
+---
+phase: 18-global-items-public-profiles
+plan: 01
+subsystem: database
+tags: [drizzle, postgres, zod, schema, global-items, profiles]
+
+requires:
+  - phase: 17-object-storage
+    provides: "S3 storage service, pgTable schema with userId columns"
+provides:
+  - "globalItems table for crowd-sourced gear database"
+  - "itemGlobalLinks junction table linking user items to global catalog"
+  - "User profile fields (displayName, avatarUrl, bio) on users table"
+  - "Setup visibility (isPublic) on setups table"
+  - "Zod schemas for global item search, item linking, profile update"
+  - "TypeScript types inferred from Drizzle and Zod"
+  - "Bikepacking gear seed data (18 items, 7 categories)"
+affects: [18-02, 18-03, 18-04, 18-05]
+
+tech-stack:
+  added: []
+  patterns: ["Global items as separate table from user items, linked via junction table"]
+
+key-files:
+  created:
+    - "src/db/global-items-seed.json"
+    - "drizzle-pg/0001_tough_boomerang.sql"
+  modified:
+    - "src/db/schema.ts"
+    - "src/shared/schemas.ts"
+    - "src/shared/types.ts"
+
+key-decisions:
+  - "Global items table uses text category field (not FK) for flexibility with crowd-sourced data"
+  - "itemGlobalLinks has unique constraint on itemId (one global item per user item)"
+  - "Seed data covers 7 categories with 18 real bikepacking products"
+
+patterns-established:
+  - "Junction table pattern for linking user-owned entities to global catalog"
+  - "isPublic boolean with default false for gradual visibility opt-in"
+
+requirements-completed: [GLOB-01, GLOB-02, PROF-01, PROF-03]
+
+duration: 3min
+completed: 2026-04-05
+---
+
+# Phase 18 Plan 01: Schema Foundations Summary
+
+**Global items table, item-global links, user profile columns, setup visibility, Zod schemas, and 18-item bikepacking seed catalog**
+
+## Performance
+
+- **Duration:** 3 min
+- **Started:** 2026-04-05T10:57:03Z
+- **Completed:** 2026-04-05T10:59:44Z
+- **Tasks:** 2
+- **Files modified:** 5
+
+## Accomplishments
+- Added globalItems and itemGlobalLinks tables to Postgres schema with proper FK constraints
+- Extended users table with displayName, avatarUrl, bio profile fields
+- Extended setups table with isPublic boolean for public sharing
+- Created Zod validation schemas and TypeScript types for all new entities
+- Built 18-item bikepacking gear seed catalog with real product data
+
+## Task Commits
+
+Each task was committed atomically:
+
+1. **Task 1: Schema tables and column additions** - `8265703` (feat)
+2. **Task 2: Zod schemas, types, and seed data** - `81b70a7` (feat)
+
+## Files Created/Modified
+- `src/db/schema.ts` - Added boolean import, globalItems table, itemGlobalLinks table, users profile columns, setups isPublic
+- `src/shared/schemas.ts` - Added searchGlobalItemsSchema, linkItemSchema, updateProfileSchema; updated setup schemas with isPublic
+- `src/shared/types.ts` - Added GlobalItem, ItemGlobalLink, SearchGlobalItems, LinkItem, UpdateProfile types
+- `src/db/global-items-seed.json` - 18 bikepacking gear items across bags, shelters, sleep systems, cooking, hydration, lighting, racks, accessories
+- `drizzle-pg/0001_tough_boomerang.sql` - Migration for all schema changes
+
+## Decisions Made
+- Global items category stored as text (not FK to categories) since global items are hobby-agnostic and not user-scoped
+- itemGlobalLinks uses unique constraint on itemId ensuring one-to-one mapping from user item to global item
+- Seed data uses real product names and approximate specs for realistic development/testing
+
+## Deviations from Plan
+
+None - plan executed exactly as written.
+
+## Issues Encountered
+None.
+
+## User Setup Required
+None - no external service configuration required.
+
+## Next Phase Readiness
+- Schema foundation complete for all Phase 18 plans
+- Plan 18-02 (global items service/routes) can proceed with globalItems table and search schema
+- Plan 18-03 (profiles/visibility) can proceed with user profile columns and updateProfileSchema
+- Migration file ready for deployment
+
+---
+*Phase: 18-global-items-public-profiles*
+*Completed: 2026-04-05*