fix(mission_runtime): full-uuid container names + assertion fix

UUIDv7 encodes time in the leading bytes so 12-hex prefixes are
NOT unique across missions minted in the same second. Docker
accepts up to 253 chars; use the full uuid.

crates/cm-api/src/mission_runtime.rs

@@ -53,14 +53,13 @@ const EDGE_NETWORK: &str = "clawmates_edge";
 /// by `clawmates-runtime.service`.
 const MISSIONS_HOST_ROOT: &str = "/var/lib/clawmates-missions";
 
-/// Deterministic docker container name for a mission's runtime. Short
+/// Deterministic docker container name for a mission's runtime.
-/// enough to fit alongside project prefixes, unique per mission.
+/// Uses the full UUID hex — UUIDv7 encodes time in the leading bytes,
+/// so a short prefix isn't guaranteed unique across missions minted
+/// in the same second. Docker permits up to 253 characters in a name,
+/// so the extra length is free.
 pub fn container_name(mission_id: Uuid) -> String {
-    let hex = mission_id.simple().to_string();
+    format!("cm-runtime-mission-{}", mission_id.simple())
-    // 12 hex chars = 48 bits of the uuid — enough to avoid collision
-    // among the missions any single deployment will ever see, and
-    // short enough to keep container names glanceable in `docker ps`.
-    format!("cm-runtime-mission-{}", &hex[..12])
 }
 
 /// Endpoint URL the topology_worker's ZeroClawDriveExecutor will dial.
@@ -304,18 +303,19 @@ mod tests {
     fn container_name_is_stable_and_prefixed() {
         let id = Uuid::parse_str("019f84a0-f2a2-7bd0-be9b-86713ec73693").unwrap();
         let name = container_name(id);
-        assert_eq!(name, "cm-runtime-mission-019f84a0f2a2");
+        assert_eq!(name, "cm-runtime-mission-019f84a0f2a27bd0be9b86713ec73693");
         // Determinism: same input → same output.
         assert_eq!(name, container_name(id));
     }
 
     #[test]
     fn container_names_differ_across_missions() {
+        // Two UUIDs differing only in the trailing hex char — full-uuid
+        // naming must distinguish them (UUIDv7's timestamp shares
+        // leading bytes for missions minted in the same second).
         let a = container_name(Uuid::parse_str("019f84a0-f2a2-7bd0-be9b-86713ec73693").unwrap());
         let b = container_name(Uuid::parse_str("019f84a0-f2a2-7bd0-be9b-86713ec7369f").unwrap());
-        // 12-char slug covers the leading bits, so different tails still
+        assert_ne!(a, b);
-        // share prefix — this test guards the *choice* of slug length.
-        assert_ne!(a, b, "container name slug must include enough entropy");
     }
 
     #[test]