docs(roadmap): add #333 — no in-session settings inspect command

[code-yeongyu]

Pinpoint #333

Gap: No /settings or /config slash command exists to dump active runtime config in-session.

Live on ee85fed:

claw --output-format json --resume latest /settings
→ {"command":"/settings","error":"Unknown slash command: /settings","type":"error"}
                                                                             ↑ "type" not "kind" (same #329 vocab violation)

Only way to inspect settings: doctor --output-format json (shows file paths, not values) or read raw config files on disk. No in-session path to see active model, sandbox_mode, plugins.enabled etc.

Fix shape: add /config or /settings slash command returning kind=config JSON with resolved settings; mark [resume]-safe; include in /help commands array.

ROADMAP.md only