Let the decider: a hand-over card can be answered now by the decider, in the ledger, with the context it saw #1604

Split from #1151 (a person's ask).

Done:

• [ ] A third tap, "Let the decider", on a hand-over card. src/crew/decide.ts (new, beside the existing deciders) answers with a reason and a confidence in the decision ledger, and the card leaves the board; undo restores it for a day.
• [ ] The context is curated and shown on the ledger row: the direction text, the repository's pinned or muted state, the day's spend against the ceiling, the owner's last ten decisions on the repository and the card's own evidence.
• [ ] An unsure answer goes back to the owner.
• [ ] Tests with a stand-in model: answered, unsure, undo, and the context on the row. No real model call in the gate.

Before pushing, run bun test test/asks.test.ts test/asks-expiry.test.ts test/check-list.test.ts with your own tests: earlier tries at this work went red on exactly those home and asks tests. A test that goes red in this pull is fixed in this pull. Name any new test file in GATE in scripts/gate.ts.

Parked by the crew: the check stayed red through 2 automatic tries (pull #1645 closed). Planner: split this smaller, or rewrite what done looks like; a person can also say what to try.