feat: Artisan checklist for application commands, hints and coverage gate

- migrate, migrate:rollback and deferred:purge gain --pretend and --force;
  they and queue:clear confirm only in production on an interactive
  terminal, so deploys over SSH proceed as before
- result lines: Applied N migrations, Rolled back <id> of <plugin>,
  Cleared N jobs from <queue>
- --json for migrate:status, key:generate, route:list, admin:token:create,
  admin:token:list, admin:token:scopes and websockets:health; -q keeps the
  key and the token
- hints for an empty DSN, an unreachable database, an invalid app.key, a
  missing uploads bucket and an application binary run below its root
- flare and websockets:health return bonfire.Reported after printing
- long help and examples for every application command, greeter:hello and
  blog:publish; cmd/summer TestCommandsDocumented fails on any gap

modules/lighthouse/README.md

@@ -237,7 +237,7 @@ for _, pub := range mem.Publications() {
 
 | Command | Description |
 |---------|-------------|
-| `websockets:health` | With an empty `realtime.centrifugo.api_key` it prints `Centrifugo not configured (API key missing)` and exits 1 without sending a request. Otherwise it prints the API URL and calls the Centrifugo `info` API method. On success it prints `Configuration OK` and a Setting/Value table (API URL, Enabled, API Key Set); on any failure it prints `Connection check failed: …` and exits 1. The API key is never printed, only whether it is set. |
+| `websockets:health` | With an empty `realtime.centrifugo.api_key` it prints `Centrifugo not configured (API key missing)` and exits 1 without sending a request. Otherwise it prints the API URL and calls the Centrifugo `info` API method. On success it prints `Configuration OK` and a Setting/Value table (API URL, Enabled, API Key Set); on any failure it prints `Connection check failed: …` and exits 1. With `--json` it prints only `{"healthy", "api_url", "enabled", "api_key_set", "error"}` and exits 1 when unhealthy. The API key is never printed, only whether it is set. |
 
 ## Dependencies