Cursor skip after 3 rotations should remint a wireId, not block the session

Follow-up to conversation rotation. `skip: true` is keyed by session id and `stream()` throws for every Cursor model.

Wanted: `getWireId` remints when skip is set; do not throw session-wide. In-turn cap of 3 stays.

Conflict zone: `cursor-conversation-rotation.ts`, `cursor-agent.ts` shouldSkip throw.
Depends on #996 / PR #998.

Start by reading the behavior around `getWireId` in `cursor-conversation-rotation.ts` and the `shouldSkip` throw in `cursor-agent.ts`, then review the dependency in #996 and PR #998. Confirm that `skip: true` remints a wireId instead of blocking every Cursor model, while the in-turn cap of 3 remains enforced and the session can continue.

Written by the indexing model from the issue text.