chore: expose CLAUDE.md and refine .gitignore for AI tool settings

[kimyouknow]

Summary

• Refine .gitignore from blanket .claude exclusion to granular rules, allowing public project conventions to be tracked while keeping private files ignored
• Remove "Related Documents" section from CLAUDE.md (referenced private session notes)

[1/3] AI tool settings exposure series

• Next: PR 2 — expose .claude/skills/ (14 skill directories)
• Then: PR 3 — add AGENTS.md, .cursorrules, .github/copilot-instructions.md

Details

.gitignore changes (blanket → granular)

Before: All .claude/ and CLAUDE.md were ignored

After: Granular rules:

Still ignored	Reason
.claude/settings.local.json	Personal settings
.claude/memory/	Personal memory
.claude/plans/	Session temp files
.claude/agents/	Deprecated personal workflows
.claude/skills/project-decisions/	Contains internal references
.claude/*.md	Session notes with internal references

CLAUDE.md changes

• Removed "Related Documents" section (lines 209-215) — referenced private .claude/ files and context/ not suitable for public repo
• All other content unchanged

Verification

# Private files still ignored
git check-ignore .claude/settings.local.json  # ✓
git check-ignore .claude/memory/MEMORY.md     # ✓
git check-ignore .claude/skills/project-decisions/SKILL.md  # ✓

# No sensitive info in CLAUDE.md
grep -rn "kimyouknow\|/Users/\|frontend-merchant\|tossbank\|webview-kit\|slack.com" CLAUDE.md  # 0 matches

Test plan

• Private files remain git-ignored
• No sensitive information in committed files
• Build/test unaffected (no source code changes)

[github-actions]

Size Change: 0 B 🆕

Total Size: 0 B

_{compressed-size-action}

[zztnrudzz13]

GOGO