Hard-delete a mission row. No RL signal — use for noise/duplicates.

v3.7.17 — when the sidecar's swarm-suppress path calls this with ?reason=swarm_suppressed&fused=..&skeptic=..&analyst=..&optimist=.., we first emit a mission_suppressed event capturing the scout's raw_score alongside the swarm S/A/O scores BEFORE deleting. This closes the observability blind spot that hid the ~2-day, 100% suppression incident (drought began 2026-05-28 09:20:35): missions were created, deleted, and left no trace, so the queue going dry looked like an empty feed rather than mass over-veto. The raw_score vs fused-score gap in each event is the Case-A (correct junk kill) vs Case-B (buyer wrongly vetoed) discriminator — a high scout raw_score with a pinned fused0.20 flags a buyer we shouldn't have dropped. Manual MCP/UI deletes pass no reason, so their behavior is unchanged (no event, no extra read).