Adversarial review found the load-bearing invariant broken at the dispatch
layer: _dispatch_pm_work skipped only PR_REVIEW_SOURCES, so a PENDING
team=main_pm self_heal task (assigned_to=None, confirmed_by_human=False) was
routed to Main PM and spawned BEFORE the CEO approved it — the "never start
until you approve" promise didn't hold.
Fix: the PM dispatcher now also skips source='self_heal' while
confirmed_by_human is False (before the assigned/unassigned split, so it holds
either way); the task still shows in the panel so the CEO can see and approve
it. approve_and_start flips confirmed_by_human=True (the CEO's start IS the
human confirmation), so it dispatches normally afterward. Other sources are
unaffected.
Tests: a unit test that the dispatcher holds an unconfirmed self_heal task but
routes a confirmed one and ordinary tasks, plus a DB test that approve_and_start
flips the gate. (The readiness gate was deliberately not used — a blocker there
marks the task `blocked`; the dispatch skip leaves it cleanly PENDING.)