Re-enable model selector as weight override control

Lembot
2026-03-18T06:44:10Z

**Depends on:** peerverity/ai-delegate#17 (saved prompt editing in AID).

The Haiku/Sonnet/Opus selector in the research tool UI was greyed out when AID integration landed. Once AID exposes editable prompts with default weights, this selector should be re-enabled to:

1. Query the default weight for the active prompt from AID and display it as the default selection
2. Allow per-invocation overrides — user picks a different tier (e.g. S/M/L) and that override is sent with the delegation request

**Acceptance criteria:**
- Model selector in research tool UI is functional again
- Selector shows the active prompt's default weight as its initial value
- Selecting a different tier sends it as a weight override to AID