Initial theme scaffold from wp-theme-template

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

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+## [0.1.0] - 2026-02-28
+
+### Added
+
+- Initial theme scaffold
+- Bootstrap 5 base templates (base, page, form, single, archive, account)
+- Template override mechanism via Twig `prependPath()`
+- Parent theme rendering delegation via render page filter
+- Theme wrapping support (`_theme_wrapped` context flag)
+- CSS override stylesheet for plugin-to-Bootstrap class mapping
+- Sticky header scroll shadow behavior
+- CI/CD release workflow (Gitea Actions)
+- Translation support (`.pot` template ready)