launch: accept config.phase_teams as a valid team source

Missions created via the new multi-team wizard have neither team_id
nor team_template_id set — they carry config.phase_teams. Both the
frontend Launch button gate and the backend set_status precondition
were checking only the old two fields, disabling launch for every
new wizard-created mission with a "No team" tooltip.

  - MissionCanvas: hasTeam now also returns true when
    mission.config.phase_teams has at least one non-empty list.
  - routes::missions::set_status: same check on the server so a
    direct API caller with only config.phase_teams also gets past
    the gate.

Directly unblocks the "we just finished the wizard, Launch is greyed
out" report. Agents materialize AFTER Launch — the button is the
trigger, not a post-condition of creation.

crates/cm-api/src/routes/missions.rs

@@ -483,8 +483,26 @@ pub async fn set_status(
     // BEFORE flipping status so a materialization failure keeps the
     // mission in draft (no orphaned "running" mission with no agents).
     if prior.status == "draft" && body.status == "running" {
-        if prior.team_id.is_none() && prior.team_template_id.is_none() {
-            eprintln!("mission {id}: launch rejected — no team_id and no team_template_id");
+        // Materializable when we have any of:
+        //   - team_id (already exists)
+        //   - team_template_id (legacy single-team path)
+        //   - config.phase_teams with at least one non-empty list (new multi-team)
+        let has_phase_teams = prior
+            .config
+            .get("phase_teams")
+            .and_then(|v| v.as_object())
+            .map(|obj| {
+                obj.values()
+                    .any(|v| v.as_array().map(|a| !a.is_empty()).unwrap_or(false))
+            })
+            .unwrap_or(false);
+        if prior.team_id.is_none()
+            && prior.team_template_id.is_none()
+            && !has_phase_teams
+        {
+            eprintln!(
+                "mission {id}: launch rejected — no team_id, no team_template_id, no config.phase_teams"
+            );
             return Err(ApiError::BadRequest);
         }
         if let Err(e) = crate::mission_orchestrator::on_launch(