Add Claude Code gitignore

[kannkyo]

Link to the application or project's homepage

https://claude.com/

Reasons for making this change

Add a dedicated gitignore template for Claude Code, Anthropic's official CLI coding agent (claude). Claude Code stores project-level configuration and generated state in a .claude/ directory at the repository root, plus a couple of dot files. Some of these are meant to be committed and shared with the team (.claude/settings.json, .claude/rules/, .claude/skills/, .claude/commands/, .claude/agents/, .claude/agent-memory/, CLAUDE.md), while others are personal, machine-specific, or generated and should not be committed.

Links to documentation supporting these rule changes

• Explore the .claude directory — settings.local.json is flagged as gitignored; .claude/agent-memory-local/ is where local subagent memory is written to keep it out of version control (project-shared memory lives in the committed .claude/agent-memory/).
• Memory — Choose where to put CLAUDE.md files — “./CLAUDE.local.md … Personal project-specific preferences; add to .gitignore.”
• Worktrees — Start Claude in a worktree — “Add .claude/worktrees/ to your .gitignore so worktree contents don't appear as untracked files in your main checkout.”

Merge and Approval Steps

• I have read the contribution guidelines and understand my PR will be closed if it doesn't meet these guidelines