## What
Adds an `agent:db` artisan command so agents (and humans) can run read
queries against the local or production database from the CLI.
```bash
php artisan agent:db "select id, email from users limit 5" # local, JSON (default)
php artisan agent:db --format=table "select count(*) from transactions" # console table
php artisan agent:db --prod "select count(*) from users" # production
```
### Options
- `--format=json` (default) — pretty-printed JSON
- `--format=table` — classic console table
- `--prod` — target the production connection (new `prod` connection
backed by `PROD_DB_URL`)
## Notes
- Read-only: uses `DB::select()`, so it won't run
`INSERT`/`UPDATE`/`DELETE`. Query errors are caught and reported.
- Adds a `querying-the-database` skill documenting the command
(auto-activates on prod/DB questions).
- De-duplicates the skills tree: `.agents/skills` is now the canonical
directory and `.claude/skills` is a symlink to it (previously both were
tracked as identical copies).
## Test plan
- [x] `php artisan test --filter=AgentDatabaseCommand` (4 passing: json,
table, invalid format, query error)
- [x] `vendor/bin/pint`
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