feat(perception): stabilize pre-capture methodology

tests/test_system_telemetry_api.py

@@ -10,6 +10,7 @@ from fastapi import APIRouter, HTTPException
 from fastapi.routing import APIRoute
 from pydantic import ValidationError
 
+from k1link.web.compute_contour_api import default_compute_contour
 from k1link.web.system_telemetry_api import (
     EXPECTED_NODE_ID,
     WorkerConnectionProfile,
@@ -17,6 +18,7 @@ from k1link.web.system_telemetry_api import (
     WorkerProfileStore,
     WorkerTelemetryService,
     _agent_raw_document,
+    _profile_from_compute_contour,
     _ssh_arguments,
     build_system_telemetry_router,
 )
@@ -272,6 +274,23 @@ def test_worker_telemetry_prefers_ndc_container_names_during_migration(
     assert triton["canonical_name"] == "ndc-mission-core-triton"
 
 
+def test_worker_telemetry_history_keeps_one_row_per_agent_observation(
+    tmp_path: Path,
+) -> None:
+    service = WorkerTelemetryService(
+        WorkerProfileStore(tmp_path / "system"),
+        lambda _: _probe(),
+        cache_seconds=0,
+    )
+
+    first = service.snapshot(10)
+    second = service.snapshot(10)
+
+    assert len(first["history"]) == 1
+    assert len(second["history"]) == 1
+    assert second["history"][0]["observed_at_utc"] == "2026-07-27T12:00:00Z"
+
+
 def test_agent_metrics_are_mapped_to_the_existing_product_contract() -> None:
     document = _agent_raw_document(
         {
@@ -340,6 +359,25 @@ def test_agent_metrics_are_mapped_to_the_existing_product_contract() -> None:
     )
 
 
+def test_compute_contour_maps_to_worker_identity_without_singleton_defaults() -> None:
+    contour = default_compute_contour().model_copy(
+        update={
+            "contour_id": "field-worker",
+            "agent_id": "field-agent",
+            "display_name": "Field Worker",
+            "expected_node_id": "FIELD-01",
+            "address": "192.0.2.25",
+        }
+    )
+
+    profile = _profile_from_compute_contour(contour)
+
+    assert profile.profile_id == "field-worker"
+    assert profile.display_name == "Field Worker"
+    assert profile.expected_node_id == "FIELD-01"
+    assert profile.address == "192.0.2.25"
+
+
 def test_profile_apply_fails_closed_on_wrong_node_and_keeps_old_profile(
     tmp_path: Path,
 ) -> None: