docs: map existing codebase with PAUL

- stack.md - PrestaShop 1.7.x, PHP, Smarty, SCSS, modules
- architecture.md - MVC + hooks, override mechanism, CQRS in src/
- structure.md - Directory layout, key file locations
- conventions.md - PHP/Smarty/SCSS/JS conventions, PS patterns
- testing.md - No automated tests in custom modules
- integrations.md - Allegro, Empik, BaseLinker, shipping, payments
- concerns.md - Override fragility, EOL risk, missing CI/CD
- db_schema.md - Custom tables, modified core tables

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

.paul/STATE.md

@@ -0,0 +1,48 @@
+# Project State
+
+## Project Reference
+
+See: .paul/PROJECT.md (updated 2026-04-27)
+
+**Core value:** Klienci B2C mogą kupić elektronikę oświetleniową online
+**Current focus:** Project initialized — ready for planning
+
+## Current Position
+
+Milestone: v0.1 Initial Release
+Phase: Not yet defined
+Plan: None yet
+Status: Ready to create roadmap and first PLAN
+Last activity: 2026-04-27 — Project initialized
+
+Progress:
+- Milestone: [░░░░░░░░░░] 0%
+
+## Loop Position
+
+Current loop state:
+```
+PLAN ──▶ APPLY ──▶ UNIFY
+  ○        ○        ○     [Ready for first PLAN]
+```
+
+## Accumulated Context
+
+### Decisions
+None yet.
+
+### Deferred Issues
+None yet.
+
+### Blockers/Concerns
+None yet.
+
+## Session Continuity
+
+Last session: 2026-04-27
+Stopped at: Project initialization complete
+Next action: Run /paul:plan to define phases and first plan
+Resume file: .paul/PROJECT.md
+
+---
+*STATE.md — Updated after every significant action*