SH-128-03: approve_plan set status APPROVED before dispatching the follow-up
run and had no already-approved guard, so a failed dispatch left the plan stuck
approved-but-undispatched and a double-submit double-dispatched + double-posted
the Slack notice. And the Slack notice counted len(comments) including empty
comments _format_comments filters out.
- Return 409 when the plan is already approved (idempotent double-click/retry).
- Dispatch the implementation run BEFORE persisting APPROVED so a dispatch
failure leaves the plan re-approvable. _dispatch_followup passes plan_mode
explicitly, so the run is unaffected by the reorder.
- Count only non-empty comments in the Slack approval notice.
Fixed here (not on #128) because #128's approve_plan is rewritten on this
branch; #129 inherits it. Adds tests for the 409, the filtered count, and the
dispatch-before-status ordering.
Adam Moussa
5d2eb20f29