v0.4.0

Changelog

• e39dfad docs(readme): point to Instalación section instead of stale 'make install' ref
• cc94dbb feat(cli): add --json and --explain flags to fit subcommand
• 47ba312 feat(cli): add --version and -V flags
• b268c6e feat(cli): add doctor subcommand for system tooling audit
• c2c7df6 feat(cli): add local subcommand for installed Ollama models
• e61bed2 feat(cli): publish JSON Schema for fit --json output
• d2394f2 feat(tui): fuzzy match in / search
• 1076c69 refactor(cli): extract subcommands from main.go into internal/cmd
• 9d8ab0c refactor(cli): inject hardware.Detect + catalog.Fetch behind loader.Source