Rewrite job_runner, event_bridge, cost estimator, and DigiKey client.

Local pid-file dispatch stays the self-host path. DigiKey still rejects unrelated MPNs. Inherited copies remain on disk.

tests/test_periscope_services_dispatch_rewrite.py

@@ -0,0 +1,40 @@
+"""Leftover dispatcher/cost/DigiKey modules load from src."""
+
+from __future__ import annotations
+
+from pathlib import Path
+
+import backend.services.cost_estimator as cost_estimator
+import backend.services.digikey as digikey
+import backend.services.event_bridge as event_bridge
+import backend.services.job_runner as job_runner
+from backend.services.digikey import _find_product
+from backend.services.job_runner import get_execution_state
+
+
+def test_dispatcher_modules_are_src():
+    for mod, name in (
+        (job_runner, "job_runner.py"),
+        (event_bridge, "event_bridge.py"),
+        (cost_estimator, "cost_estimator.py"),
+        (digikey, "digikey.py"),
+    ):
+        path = Path(mod.__file__).resolve()
+        assert path.name == name
+        assert "src" in path.parts
+        assert "Native Periscope overlay" not in path.read_text(encoding="utf-8")[:400]
+
+
+def test_digikey_rejects_unrelated_and_accepts_family():
+    products = [{"ManufacturerProductNumber": "CH340E"}]
+    assert _find_product("CH340", products) is None
+    products = [{"ManufacturerProductNumber": "24AA025E64-I/SN"}]
+    assert _find_product("24AA025E64", products) is not None
+
+
+def test_stale_pid_is_failed(tmp_path, monkeypatch):
+    monkeypatch.setattr(job_runner.settings, "data_dir", tmp_path)
+    pid_path = tmp_path / "workers" / "proj.pid"
+    pid_path.parent.mkdir(parents=True)
+    pid_path.write_text("99999999")
+    assert get_execution_state("local/projects/proj") == "failed"