docs(03): complete Phase 3 via parallel execution

Phase 3 (Job Management Core) executed with 4 parallel agents:
- 03-01: Job submission form (15 min)
- 03-02: Job edit form (12 min)
- 03-03: Admin notification (8 min)
- 03-04: Admin UI enhancements (15 min)

Execution waves:
- Wave 1: 03-01 (independent)
- Wave 2: 03-02, 03-03 (both depend on 03-01, no file conflicts)
- Wave 3: 03-04 (depends on 03-03 via shared files)

All 4 plans completed successfully with 0 failures.
Wall clock time: ~50 min (parallelized from ~60 min sequential estimate)

Updated:
- ROADMAP.md: Phase 3 marked complete
- STATE.md: Progress 44%, velocity metrics updated, decisions recorded

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

.planning/ROADMAP.md

@@ -12,7 +12,7 @@ None
 
 - [x] **Phase 1: Foundation & Setup** - Plugin structure, CPT registration, custom role
 - [x] **Phase 2: Provider Registration & Auth** - Registration form, login system, dashboard foundation
-- [ ] **Phase 3: Job Management Core** - Job submission, editing, moderation workflow
+- [x] **Phase 3: Job Management Core** - Job submission, editing, moderation workflow
 - [ ] **Phase 4: Job Deactivation System** - Deactivation workflow with reason capture
 - [ ] **Phase 5: Mentor Job Board** - Protected archive, detail pages, apply system
 - [ ] **Phase 6: Email Notifications** - Admin alerts and mentor opt-in notifications
@@ -52,10 +52,10 @@ Plans:
 **Plans**: 4 plans
 
 Plans:
-- [ ] 03-01: Job submission form (F2) with pending status
-- [ ] 03-02: Job edit form (F3) with ownership validation
-- [ ] 03-03: Admin notification hook on job submission
-- [ ] 03-04: Admin moderation UI enhancements
+- [x] 03-01: Job submission form (F2) with pending status
+- [x] 03-02: Job edit form (F3) with ownership validation
+- [x] 03-03: Admin notification hook on job submission
+- [x] 03-04: Admin moderation UI enhancements
 
 ### Phase 4: Job Deactivation System
 **Goal**: Deactivation form with reason capture, status update to draft, admin notification with reason