feat: enhance list command with JSON output, sorting and filtering

[hiSandog]

Summary

Enhances the gitnexus list command with new features:

• Add --json flag for script-friendly JSON output
• Add --sort option to sort by name, indexed date, files, or symbols
• Add --filter option to search repositories by name or path

Usage Examples

# List all repos sorted by name
gitnexus list --sort name

# Output as JSON for scripting
gitnexus list --json

# Filter repositories
gitnexus list --filter myproject

# Combined usage
gitnexus list --json --sort files --filter api

[vercel]

Someone 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.