feat(cli): add gitnexus uninstall command

[gentritbiba]

Summary

• Adds gitnexus uninstall command that fully reverses both setup and analyze
• Removes per-repo artifacts: .gitnexus/ index, GitNexus sections from AGENTS.md/CLAUDE.md (preserving user content), .claude/skills/gitnexus/, registry entries
• Removes global artifacts (--global): Cursor/OpenCode MCP configs, Claude Code MCP (claude mcp remove), hooks from both settings.json and hooks.json, hook scripts, skills across all editors (Claude/Cursor/OpenCode), ~/.gitnexus/ directory
• Combined mode (--all): removes both per-repo and global
• Executes by default; --dry-run for preview only
• Cross-platform: uses os.homedir() + path.join() throughout, Windows-aware

Usage

gitnexus uninstall                # remove per-repo artifacts
gitnexus uninstall --global       # remove global editor configs
gitnexus uninstall --all          # remove everything
gitnexus uninstall --dry-run      # preview what would be removed

Test plan

• gitnexus uninstall --help shows correct options
• gitnexus uninstall --dry-run shows per-repo preview
• gitnexus uninstall --dry-run --global shows global preview
• gitnexus uninstall --dry-run --all shows combined preview
• TypeScript compiles cleanly (tsc)
• gitnexus uninstall removes per-repo artifacts
• gitnexus uninstall --global removes global artifacts
• gitnexus uninstall --all removes everything

Closes #112

[vercel]

@gentritbiba is attempting to deploy a commit to the NexusCore Team on Vercel.

A member of the Team first needs to authorize it.

[magyargergo]

⚠️ Upcoming Prettier formatting — rebase instructions

PR #563 adds Prettier as the code formatter for the repo. When it merges, the bulk format commit will touch ~350 files (style-only: whitespace, quotes, trailing commas). Your branch will likely conflict.

After #563 merges, rebase your branch:

git fetch origin
git checkout <your-branch>
git rebase origin/main

# Conflicts will be formatting-only — accept your version:
git checkout --theirs .
git add .
git rebase --continue

# Then re-format your branch to match the new style:
npx prettier --write .
git add -A
git commit -m "style: apply prettier formatting"
git push --force-with-lease

New setup step: Run npm install at the repo root (not just in gitnexus/) to get prettier + activate the pre-commit hook. The hook auto-formats staged files on every commit going forward.

[magyargergo]

Please submit a new PR if this is still relevant