feat: npm install -g readiness — files field, publishConfig, --version flag

[flyingrobots]

Summary

Make @neuroglyph/git-mind ready for npm install -g by adding:

• files field to package.json (controls what gets published)
• publishConfig: { "access": "public" } (required for scoped packages)
• Fix exports — remove non-existent types entry
• Add homepage and bugs fields
• --version / -v flag to CLI
• src/version.js — reads version from package.json
• Export VERSION and NAME from public API

Acceptance Criteria

• npm pack --dry-run shows only runtime files
• git mind --version prints the version
• VERSION and NAME exported from src/index.js