docs(03-03): complete billing management page plan — human-verify approved

- Updated SUMMARY.md: Task 2 (human-verify) marked approved, plan fully complete
- STATE.md: progress updated to 100%, decisions recorded, session updated
- ROADMAP.md: phase 3 plan progress updated (4/4 summaries complete)

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

.planning/STATE.md

@@ -3,14 +3,14 @@ gsd_state_version: 1.0
 milestone: v1.0
 milestone_name: milestone
 status: executing
-stopped_at: "Completed 03-02-PLAN.md (checkpoint: awaiting human-verify Task 3)"
-last_updated: "2026-03-23T21:55:00.000Z"
-last_activity: 2026-03-23 — Completed 03-02 onboarding wizard and BYO API key management
+stopped_at: Completed 03-04-PLAN.md — all Phase 3 plans complete
+last_updated: "2026-03-24T03:51:36.949Z"
+last_activity: 2026-03-23 — Completed 03-02 onboarding wizard, Slack OAuth, BYO API keys
 progress:
   total_phases: 3
-  completed_phases: 2
+  completed_phases: 3
   total_plans: 14
-  completed_plans: 12
+  completed_plans: 14
   percent: 86
 ---
 
@@ -63,6 +63,9 @@ Progress: [█████████░] 86%
 | Phase 03-operator-experience P01 | 22m | 3 tasks | 20 files |
 | Phase 03-operator-experience P03 | ~8m | 1 tasks | 6 files |
 | Phase 03-operator-experience P04 | 10m | 1 tasks | 8 files |
+| Phase 03-operator-experience P02 | ~35min | 2 tasks | 10 files |
+| Phase 03-operator-experience P03 | 8min | 2 tasks | 6 files |
+| Phase 03-operator-experience P04 | 10min | 2 tasks | 8 files |
 
 ## Accumulated Context
 
@@ -121,6 +124,16 @@ Recent decisions affecting current work:
 - [Phase 03-operator-experience]: Test message step is REQUIRED in onboarding — no skip button (per user decision)
 - [Phase 03-operator-experience]: Onboarding wizard step state in URL searchParams (step=1|2|3) — shareable and browser-refresh safe
 - [Phase 03-operator-experience]: Portal git initialized as submodule with own .git repo — enables atomic per-task commits in packages/portal; parent repo tracks gitlink
+- [Phase 03-operator-experience]: Agent goes live automatically after test message — is_active is true by default, no separate Go Live button (per user decision)
+- [Phase 03-operator-experience]: Test message step is REQUIRED in onboarding — no skip button (per user decision)
+- [Phase 03-operator-experience]: Onboarding wizard step state in URL searchParams (step=1|2|3) — shareable and browser-refresh safe
+- [Phase 03-operator-experience]: Portal git initialized as submodule with own .git repo — enables atomic per-task commits in packages/portal; parent repo tracks gitlink
+- [Phase 03-operator-experience]: window.location.href used for Stripe redirects (not router.push) — Stripe Checkout/Portal URLs are external domains
+- [Phase 03-operator-experience]: use(searchParams) in billing page client component — Next.js 15 searchParams is a Promise, must be unwrapped with React.use()
+- [Phase 03-operator-experience]: BillingStatus uses inline Tailwind color classes — existing Badge variants lack semantic blue/green/amber/red states needed for subscription status
+- [Phase 03-operator-experience]: recharts installed with --force due to npm ENOTEMPTY race bug — was in package.json but not node_modules
+- [Phase 03-operator-experience]: Usage nav links to /usage tenant picker (not hardcoded tenantId) — supports multi-tenant operators
+- [Phase 03-operator-experience]: BudgetAlertBadge renders neutral 'No limit set' for null budget_limit_usd — prevents false alarms
 
 ### Pending Todos
 
@@ -132,6 +145,6 @@ None yet.
 
 ## Session Continuity
 
-Last session: 2026-03-23T21:55:00.000Z
-Stopped at: Completed 03-02 Tasks 1-2 — checkpoint human-verify Task 3 (onboarding wizard + BYO keys)
+Last session: 2026-03-24T03:51:27.331Z
+Stopped at: Completed 03-04-PLAN.md — all Phase 3 plans complete
 Resume file: None