missions: surface per-phase run errors on the phase card

Adds inline failure debugging to the Phases tab. When you see a
phase card marked FAILED, click the collapsed error summary and the
full topology_run.error text expands under it — the exact stack
trace / provider error / whatever the worker recorded.

Backend:
  - TopologyRunSummary gains mission_phase_id + team_id + error
    fields. list_by_mission SELECT extended; other constructor
    (list_recent) explicitly passes None for the new fields.
  - GET /api/missions/{id}/runs response now carries all of the
    above so the frontend can attribute failures per phase.

Frontend:
  - MissionRunSummary type mirrors backend additions.
  - MissionCanvas fetches runs alongside mission on load +
    auto-refresh; indexes by mission_phase_id in a memoized Map.
  - Each phase card renders a per-run row: colored status pill
    (running / completed / failed), short run id, finished_at
    timestamp. For failed runs, a <details> collapses the error
    text — first line as summary, full 4kB in a monospace <pre> on
    expand.

Directly unblocks the "phase says Failed but there's no info to
debug" report. Both research and coding phases get this — the code
path is phase-kind-agnostic.

crates/cm-db/src/repo/topology_runs.rs

@@ -22,6 +22,14 @@ pub struct TopologyRunSummary {
     pub created_at: OffsetDateTime,
     #[serde(with = "time::serde::rfc3339::option")]
     pub finished_at: Option<OffsetDateTime>,
+    /// FK to mission_phases when the run was enqueued by phase_runner.
+    /// Frontend uses this to attribute failures to the right phase card.
+    pub mission_phase_id: Option<Uuid>,
+    pub team_id: Option<Uuid>,
+    /// The last error message the worker recorded; only populated when
+    /// status = 'failed'. Trimmed here to first 4kB to keep the API
+    /// response small; the full text lives in topology_runs.error.
+    pub error: Option<String>,
 }
 
 /// A full saved comparison run.
@@ -365,6 +373,9 @@ pub async fn list_recent(
             kind: r.kind,
             created_at: r.created_at,
             finished_at: r.finished_at,
+            mission_phase_id: None,
+            team_id: None,
+            error: None,
         })
         .collect())
 }
@@ -379,7 +390,9 @@ pub async fn list_by_mission(
 ) -> Result<Vec<TopologyRunSummary>, DbError> {
     use sqlx::Row;
     let rows = sqlx::query(
-        "SELECT id, task, status, kind, created_at, finished_at
+        "SELECT id, task, status, kind, created_at, finished_at,
+                mission_phase_id, team_id,
+                LEFT(coalesce(error, ''), 4096) AS error
          FROM topology_runs
          WHERE mission_id = $1 ORDER BY created_at DESC LIMIT $2",
     )
@@ -396,6 +409,16 @@ pub async fn list_by_mission(
             kind: r.get("kind"),
             created_at: r.get("created_at"),
             finished_at: r.try_get("finished_at").ok(),
+            mission_phase_id: r.try_get("mission_phase_id").ok().flatten(),
+            team_id: r.try_get("team_id").ok().flatten(),
+            error: {
+                let s: String = r.try_get("error").unwrap_or_default();
+                if s.is_empty() {
+                    None
+                } else {
+                    Some(s)
+                }
+            },
         })
         .collect())
 }