docs(01-01): complete project scaffold and dev environment plan

Tasks completed: 2/2
- Task 1: Next.js 15 project with Docker Compose dev environment
- Task 2: Prisma schema with Tenant/User models and Vitest setup

SUMMARY: .planning/phases/01-foundation/01-01-SUMMARY.md

.planning/STATE.md

@@ -10,28 +10,28 @@ See: .planning/PROJECT.md (updated 2026-03-04)
 ## Current Position
 
 Phase: 1 of 5 (Foundation)
-Plan: 0 of 5 in current phase
-Status: Ready to plan
-Last activity: 2026-03-04 — Roadmap created, STATE.md initialized
+Plan: 1 of 5 in current phase
+Status: In progress
+Last activity: 2026-03-04 — Completed 01-01-PLAN.md (project scaffold and dev environment)
 
-Progress: [░░░░░░░░░░] 0%
+Progress: [█░░░░░░░░░] 5% (1/20 plans across all phases)
 
 ## Performance Metrics
 
 **Velocity:**
-- Total plans completed: 0
-- Average duration: -
-- Total execution time: 0 hours
+- Total plans completed: 1
+- Average duration: 11 min
+- Total execution time: 11 min
 
 **By Phase:**
 
 | Phase | Plans | Total | Avg/Plan |
 |-------|-------|-------|----------|
-| - | - | - | - |
+| 01-foundation | 1/5 complete | 11 min | 11 min |
 
 **Recent Trend:**
-- Last 5 plans: none yet
-- Trend: -
+- Last 5 plans: 01-01 (11 min)
+- Trend: establishing baseline
 
 *Updated after each plan completion*
 
@@ -46,10 +46,14 @@ Recent decisions affecting current work:
 - [Roadmap]: Inventory modeled as event-ledger (immutable movements) from Phase 4 — mutable quantity columns explicitly rejected
 - [Roadmap]: Collector balances derived from transaction log, never stored as mutable fields
 - [Roadmap]: PORT-05 (online payment) scaffolded in Phase 5 but payment gateway integration deferred to v2 per project out-of-scope decision
+- [01-01]: DATABASE_URL uses Docker service name `db` (for app container); DATABASE_URL_LOCAL uses `localhost:5432` (for host Prisma CLI)
+- [01-01]: tenantId is nullable on User — super-admins have no tenant scope, avoiding a separate SuperAdmin model
+- [01-01]: Email uniqueness is @@unique([email, tenantId]) — same email can exist across different tenants (realistic for ISP domain)
+- [01-01]: Grace period fields (suspendedAt, gracePeriodEndsAt) included on Tenant at schema creation — cannot be retrofit later
 
 ### Pending Todos
 
-None yet.
+None.
 
 ### Blockers/Concerns
 
@@ -58,6 +62,6 @@ None yet.
 
 ## Session Continuity
 
-Last session: 2026-03-04
-Stopped at: Roadmap created. ROADMAP.md, STATE.md written. REQUIREMENTS.md traceability updated. Ready to plan Phase 1.
+Last session: 2026-03-04T10:31:15Z
+Stopped at: Completed 01-01-PLAN.md (scaffold + Docker Compose + Prisma + Vitest)
 Resume file: None