chore(meta): update changelog

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

CHANGELOG.md

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+# Changelog
+
+## [Unreleased]
+
+### Added
+- "The End of an Empire" bookmark scenario with event planning
+- Province history for all Scadrian provinces
+- Bookmark localization
+- CK3 game install skill for log analysis and vanilla comparison
+- Commit skill for structured commit messages
+- Project masterplan and design ideas documents
+
+### Fixed
+- Game crash on load caused by `@#` comment prefix in mod files
+- Game crash caused by missing `ethnicities` block on all three cultures
+- Cultures not appearing in-game due to empty pillar definitions (heritage and language missing required `type`, `is_shown`, and `ai_will_do` fields)
+- Stray province errors from map cleaner due to invalid province IDs
+
+### Changed
+- Province IDs remapped from placeholders (1-105) to vanilla CK3 provinces centered on Switzerland (Kredik Shaw = Bern)
+- Updated review notes to reflect current mod status
+- Added missing modifier definitions