docs: map existing codebase

.paul/codebase/tech_changelog.md

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+# Technical Changelog
+
+> Chronological log of technical changes - what and why.
+
+## 2026-05-07 - Codebase Map Initialized
+
+**Co zrobiono / What changed:**
+- Created initial PAUL codebase documentation in `.paul/codebase/`.
+- Captured WordPress/Elementor stack, architecture, structure, conventions, testing gaps, integrations, database notes, and concerns.
+
+**Dlaczego / Why:**
+- Establish technical context before planning landing page lead-generation work.
+- Preserve warnings about secrets, backup artifacts, and custom consent/form boundaries for future sessions.
+
+---
+
+## Earlier entries
+
+No earlier technical changelog entries recorded.