/crumb-suggest — recommend the next user action
Resolve the session id (most recent if unspecified).
Preferred path — call the crumb_suggest MCP tool with {session: "<ulid>"}.
Fallback path — npx tsx src/index.ts suggest <session-id>.
Output: ▶ <primary> (single line) + rationale + command. Up to 3 alternatives.
Explicit slash form: /crumb-suggest <session-id>.
Reference: src/helpers/suggest.ts, v0.1 §11 (5 user event), §8.1 (PARTIAL → hook).