feat(media-folder-pro): add virtual folder system for WordPress media library

Custom WordPress plugin that replaces the default flat media library with
a structured folder view. Features: hierarchical folders via custom taxonomy,
sidebar folder tree, drag & drop, modal integration with Elementor/builders,
bulk assign, upload auto-assign, toast notifications.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.paul/STATE.md

@@ -0,0 +1,29 @@
+## Current Position
+
+Milestone: v0.1 Media Folders MVP — COMPLETE
+Phase: 4 of 4 (Polish & UX) — Complete
+Plan: 04-01 complete
+Status: All phases complete. Milestone delivered.
+Last activity: 2026-03-28 — UNIFY complete, milestone v0.1 finished
+
+Progress:
+- Milestone: [██████████] 100%
+- Phase 1: [██████████] 100% — Plugin Foundation + Taxonomy
+- Phase 2: [██████████] 100% — Media Library Grid Integration
+- Phase 3: [██████████] 100% — Media Upload Modal Integration
+- Phase 4: [██████████] 100% — Polish & UX
+
+## Loop Position
+
+Current loop state:
+```
+PLAN ──▶ APPLY ──▶ UNIFY
+  ✓        ✓        ✓     [Milestone complete]
+```
+
+## Session Continuity
+
+Last session: 2026-03-28
+Stopped at: Milestone v0.1 complete
+Next action: Test plugin on live WordPress, then plan v0.2 if needed
+Resume file: .paul/phases/04-polish-ux/04-01-SUMMARY.md