feat(backlog): extract the execution loop into work-the-backlog.org

work-the-backlog.org now owns the autonomous execution loop: the mechanical eligibility gate, the four-item defer checklist, the per-task quality bar, and the run-cap kill switch, fed a task set, session mode, and cap by its callers. I stubbed the pre-flight Q&A, waiver read, end-of-set page, and metrics record with pointers to their phases.

inbox.org's auto mode drops its execute step. Per-cycle item 3 routes and queues only, so the loop has one home. This is Phase 1 of the autonomous-batch execution spec.

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