Exclude .claude/ from the Docker build context

Keeps local Claude Code settings out of the build context alongside the
other editor directories. No effect on the image itself -- the Dockerfile
only copies scripts/, configs/ and examples/ -- but the directory was
being sent to the daemon on every build.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

.dockerignore

@@ -23,6 +23,7 @@ temp/
 # IDE files
 .vscode/
 .idea/
+.claude/
 *.swp
 *.swo