fix(lanes): expire stale stage detections, cover raw test runs in ship-feature gates

withDetected() rendered lane.detected_stage forever once written — the TTL in
recordDetection only stops future writes from advancing past a stale floor, it
never clears the row, so a lane gone quiet kept painting amber nodes from
activity that was no longer current. Also add the shared test-runner regex to
the ship-feature pipeline's `gates` node: Stage 1b's independent-test subagent
runs the repo's test command directly, not through `ccam`, and had no
detection fallback if `ccam stage tests` was skipped.

server/lib/lanes.js

@@ -466,8 +466,15 @@ function classifyLiveness({ status, stage, ageSec }, deadSec = DEAD_SEC) {
  * would otherwise render as an inference instead of the blue `current` ring.
  * Past nodes go through `stageRecords`, which resolves those alias keys — a
  * node the agent DECLARED must never be painted as merely detected.
+ *
+ * A detection older than the TTL is treated the same as no detection: the TTL
+ * in recordDetection only stops it from holding the forward-only floor for
+ * FUTURE writes, it never clears the row, so without this check a lane that
+ * went quiet would keep painting amber nodes from activity that is no longer
+ * current — the exact stale-progress illusion detection exists to avoid.
  */
 function withDetected(states, pipeline, lane) {
+  if (detectionIsStale(lane.detected_at)) return states.map((n) => ({ ...n, detected: false }));
   const detectedIdx = phaseIdx(pipeline, lane.detected_stage);
   if (detectedIdx === -1) return states.map((n) => ({ ...n, detected: false }));
   const records = stageRecords(pipeline, lane.stages);