GTM API / Release mass-action canary

Open the canary gate by hand: stamps canary_satisfied_at and releases every remaining item, the same sweep the canary would have triggered by succeeding. Use it when the first item failed for a reason you accept, or when you do not want to wait for it. Valid only while the run is live, canary_mode=first_item and the gate is still closed, else 409 invalid_transition. Releasing a PAUSED run stamps the gate but dispatches nothing until resume_mass_action: the pause dominates. A canary_failed run nobody decides on for 7 days (retry, release or delete) settles itself: its pending items are cancelled. Contract: - MCP tool release_mass_action_canary, registry package mcp.orchestration/mass_actions, mount orchestration.mass_actions. - Operation action, response envelope action. - Flags: none.