fix(config): require doctor for invalid configs (#764 — thanks @mukhtharcm)

docs/start/wizard.md

@@ -64,6 +64,8 @@ Tip: `--json` does **not** imply non-interactive mode. Use `--non-interactive` (
 
 1) **Existing config detection**
    - If `~/.clawdbot/clawdbot.json` exists, choose **Keep / Modify / Reset**.
+   - If the config is invalid or contains legacy keys, the wizard stops and asks
+     you to run `clawdbot doctor` before continuing.
    - Reset uses `trash` (never `rm`) and offers scopes:
      - Config only
      - Config + credentials + sessions