search: drop the UserPromptSubmit hook
Commit

Descriptions alone route research/investigate/search prompts to the Entire search skill (20/20 eval runs), so the Claude-only hook is unnecessary.
Co-Authored-By: Claude Fable 5.1 noreply@anthropic.com Claude-Session: https://claude.ai/code/session_01P89NYpxST5YeWwpYR1k3A6 Entire-Checkpoint: 83ff7b3060b0
Checkpoints
Checkpoint 1