feat(sentry): add refactor finding and an opt-in solo-implementation pass

Two additions from Craig, both landing on the throwaway branch that already makes a bad night a deleted branch.

Pass 11 now finds refactoring opportunities alongside bugs, filing each as a graded task. Still find-never-fix: a fresh finding files a task and stops, because a just-found bug can be a misread (one was filed and retracted two fires apart on 2026-07-23). The task is the checkpoint.

New pass 12 implements the backlog's solo, decision-free tasks on the branch, off by default behind :SENTRY_MAY_IMPLEMENT:. It reuses work-the-backlog's unattended-loop contract: only the ready bucket runs, anything needing a decision defers to a VERIFY, and nothing pushes. The morning review is the gate. Its /review-code runs the premise check first (reproduce the bug before judging the diff), because a filed claim never gets a review, and that skeptical review is what makes fixing on a branch safe. A finding that fails its premise check isn't implemented.

The marker is separate from :COMMIT_AUTONOMY: on purpose: hygiene is a two-minute merge, implemented code is a review session, so the owner opts in per project.

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