Intent jot: one terse line enriched into a full thread brief #347

Inspired by Granola's hybrid-notes mechanic: the human jots rough fragments, the AI merges them with ambient context into the full artifact — the human's jot is the skeleton, the machine fills in.

For Solenta: a quick-capture box (global hotkey) where the user types one terse line ('auth timeout is back, try refreshing before expiry'); Solenta enriches it with recent thread history, failing tests, and relevant memory into a full thread brief for dispatch. Captures intent at the moment it occurs — the missing front-end of auto-dispatch (#165) and triage (#258).