diff --git a/docs/superpowers/plans/2026-06-21-cyclone-pipeline-agent.md b/docs/superpowers/plans/2026-06-21-cyclone-pipeline-agent.md
index 4c8ccdb..286408e 100644
--- a/docs/superpowers/plans/2026-06-21-cyclone-pipeline-agent.md
+++ b/docs/superpowers/plans/2026-06-21-cyclone-pipeline-agent.md
@@ -2392,13 +2392,32 @@ async def test_phase1_preflight_passes_when_backend_healthy(tmp_path: Path):
 
 
 @pytest.mark.asyncio
+@respx.mock
 async def test_phase1_preflight_fails_fast_if_browser_down(tmp_path: Path):
     """If the Vite dev server is not reachable, phase 1 fails-fast
     with BrowserNotReachableError before phase 2 even tries."""
     from cyclone_pipeline.exceptions import BrowserNotReachableError
+    respx.get("http://127.0.0.1:8000/api/health").mock(
+        return_value=Response(200, json={
+            "status": "ok", "version": "0.1.0",
+            "db": {"ok": True},
+            "scheduler": {"running": True, "interval_s": 60},
+            "pubsub": {}, "batch": {},
+        })
+    )
+    respx.get("http://127.0.0.1:8000/api/admin/scheduler/status").mock(
+        return_value=Response(200, json={
+            "running": True, "interval_s": 60,
+            "sftp_block": "co_medicaid",
+        })
+    )
+    # Make the head request fail with a connection error
+    respx.head("http://127.0.0.1:9999/").mock(
+        side_effect=httpx.ConnectError("Connection refused")
+    )
     cfg = PipelineConfig(
         api_base="http://127.0.0.1:8000",
-        browser_base="http://127.0.0.1:9999",  # nothing listens here
+        browser_base="http://127.0.0.1:9999",
         run_dir=tmp_path / "runs",
         headless=True,
     )
@@ -2526,11 +2545,15 @@ class CyclonePipeline:
                 f"Backend unhealthy: {snap.model_dump()}"
             )
         sched = await self._client.scheduler_status()
-        # Verify the browser-side URL is reachable
+        # Verify the browser-side URL is reachable. We use the same
+        # httpx.AsyncClient as the API calls so tests can mock the
+        # head request via `respx`.
         try:
-            async with httpx.AsyncClient(timeout=5.0) as http:
-                r = await http.head(self.cfg.browser_base + "/")
-                r.raise_for_status()
+            assert self._client._http is not None  # type: ignore[attr-defined]
+            r = await self._client._http.head(  # type: ignore[attr-defined]
+                self.cfg.browser_base + "/"
+            )
+            r.raise_for_status()
         except httpx.HTTPError as e:
             raise BrowserNotReachableError(self.cfg.browser_base) from e
         result = PhaseResult(
@@ -2950,6 +2973,10 @@ Append to `cyclone_pipeline/pipeline.py`:
         self.run_state.pending_data["submission_filename"] = (
             result_obj.filename
         )
+        # Record the moment phase 4 completed; phase 7 uses this as
+        # the `since` for `processed-files` so we only see inbound
+        # files from the MFT scheduler *after* our submit.
+        self.run_state.pending_data["phase4_at"] = _now_iso()
         log.info(
             "phase4_submit_ok",
             submission_id=result_obj.submission_id,
@@ -3418,7 +3445,7 @@ Append to `cyclone_pipeline/pipeline.py`:
         t0 = time.monotonic()
         assert self._client is not None
         since = self.run_state.pending_data.get(
-            "submission_filename_set_at", self.run_state.started_at
+            "phase4_at", self.run_state.started_at
         )
         files = await self._client.processed_files(since=since)
         html_files = [f for f in files if f.kind == "html"]
@@ -3442,10 +3469,8 @@ Append to `cyclone_pipeline/pipeline.py`:
             result_detail=self._result_detail(),
             started_at=self.run_state.started_at,
             finished_at=_now_iso(),
-            duration_s=(
-                _iso_to_monotonic(self.run_state.started_at) -
-                _iso_to_monotonic(self.run_state.started_at) +
-                sum(p.duration_s for p in self.run_state.completed_phases)
+            duration_s=sum(
+                p.duration_s for p in self.run_state.completed_phases
             ),
             phases=list(self.run_state.completed_phases),
             expected_835_by=expected_835,
@@ -3548,18 +3573,6 @@ def _next_monday_iso() -> str:
         return now_mt.date().isoformat()
     days_ahead = (7 - weekday) % 7 or 7
     return (now_mt + timedelta(days=days_ahead)).date().isoformat()
-
-
-def _iso_to_monotonic(iso: str) -> float:
-    """Best-effort ISO→monotonic. Returns 0.0 on parse error so the
-    report's `duration_s` is at least non-negative."""
-    try:
-        from datetime import datetime
-        return datetime.fromisoformat(
-            iso.replace("Z", "+00:00")
-        ).timestamp()
-    except (ValueError, AttributeError):
-        return 0.0
 ```
 
 - [ ] **Step 4: Run test to verify it passes**