Status-only verdict model: comments NEVER drive the pipeline. Removed the
whole comment-based control mechanism from handle_comment (:approved: /
:rejected: / answer-to-questions) which caused bug 3 (echo self-hit): the
analyst posts its own "waiting for approval" comment, handle_comment catches
its own comment and reverts In Review -> In Progress. handle_comment is now a
pure logger with no side effects.
handle_status_start: a return to In Progress on an EXISTING task (Slava
answered the analyst questions in Needs Input) now RELAUNCHES the stage agent
instead of being a no-op. Distinguished from a duplicate In Progress webhook
via has_active_job_for_task() (new db helper): no active job => agent idle =>
relaunch; active job => busy => skip (no double launch).
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