chore: remove devlogs from version control

Working notes, not project content. Files stay on disk under
docs/devlog/, now gitignored.

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

Author: lroolle

.gitignore

@@ -7,6 +7,9 @@ sessions/
 # design mockups (not shipped)
 assets/palette-retheme-mockup.svg
 
+# devlogs — working notes, not project content
+docs/devlog/
+
 # local captures and secrets — never version
 .cctrace/
 .env