fix(ci): kill otelrecv with SIGKILL in cleanup, add timing logs, re-enable OTEL

Three changes:
- cleanup() now uses kill -9 instead of kill (SIGTERM) to prevent wait hanging
  if otelrecv's signal handler stalls
- adds [HH:MM:SS] log lines at key points so CI logs show exactly where time is spent
- restores OTEL env vars (via env VAR=val) since they were confirmed not to cause the hang

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Taskfile.yml

@@ -257,24 +257,25 @@ tasks:
       - |
         DAGGER_OUT=$(mktemp)
         RC_FILE=$(mktemp)
-        # Run dagger with timeout; capture output for retry/teardown-hang detection.
+        _ts() { date -u '+[%H:%M:%S]'; }
         run_dagger() {
           : > "$DAGGER_OUT"; : > "$RC_FILE"
+          echo "$(_ts) dagger: start" >&2
           { timeout --kill-after=10 600 "$@"; echo $? > "$RC_FILE"; } 2>&1 | tee "$DAGGER_OUT"
           RC=$(cat "$RC_FILE" 2>/dev/null || echo 1)
+          echo "$(_ts) dagger: pipeline done RC=$RC" >&2
           if [ "$RC" -eq 124 ] && grep -q "All tests passed" "$DAGGER_OUT"; then
-            echo "Note: dagger hung in teardown after success; treating as exit 0." >&2
+            echo "$(_ts) dagger: hung in teardown after success; treating as exit 0." >&2
             RC=0
           fi
           return "$RC"
         }
-        # Retry on TCP-level failures; propagate real test failures immediately.
         retry_dagger() {
           for attempt in 1 2 3; do
             run_dagger "$@" && return 0
             RC=$?
             if [ "$attempt" -lt 3 ] && grep -qE "connection reset|context canceled|connection refused" "$DAGGER_OUT"; then
-              echo "Network error on attempt $attempt/3, retrying..." >&2
+              echo "$(_ts) dagger: network error on attempt $attempt/3, retrying..." >&2
             else
               return "$RC"
             fi
@@ -290,16 +291,23 @@ tasks:
         python3 ci/otelrecv.py --port-file="$PORTFILE" &
         RECV_PID=$!
         cleanup() {
-          kill "$RECV_PID" 2>/dev/null
+          echo "$(_ts) cleanup: killing otelrecv pid=$RECV_PID" >&2
+          kill -9 "$RECV_PID" 2>/dev/null
           wait "$RECV_PID" 2>/dev/null
+          echo "$(_ts) cleanup: done" >&2
           rm -f "$PORTFILE" "$DAGGER_OUT" "$RC_FILE"
         }
         trap cleanup EXIT
         until [ -s "$PORTFILE" ]; do sleep 0.05; done
         PORT=$(cat "$PORTFILE")
-        retry_dagger \
+        echo "$(_ts) otelrecv: ready on port $PORT" >&2
+        retry_dagger env \
+          OTEL_EXPORTER_OTLP_ENDPOINT="http://127.0.0.1:$PORT" \
+          OTEL_EXPORTER_OTLP_PROTOCOL="http/protobuf" \
           dagger call --progress=plain -q -m ci --source=. check
-        exit $?
+        RC=$?
+        echo "$(_ts) dagger: final RC=$RC" >&2
+        exit $RC
 
   integration-android:
     desc: UI integration tests on a connected Android emulator (Stalwart on host, emulator reaches it via 10.0.2.2)