diff --git a/.codex/skills/mission-core-product-ui/SKILL.md b/.codex/skills/mission-core-product-ui/SKILL.md
index f14d2cb..cfe8a73 100644
--- a/.codex/skills/mission-core-product-ui/SKILL.md
+++ b/.codex/skills/mission-core-product-ui/SKILL.md
@@ -26,6 +26,23 @@ Before changing UI:
 Do not start implementation before resolving the required controls and icons in
 the registries.
 
+## Canonical local endpoint
+
+- Keep the integrated Mission Core Control Station and API exclusively on
+  `http://127.0.0.1:8000`.
+- Never start a second integrated backend on an alternate port to bypass a
+  stale or occupied `8000`. In particular, TCP `8765` is a legacy Foxglove
+  regression port and is not an operator path.
+- Before browser QA or product handoff, inspect listeners on `8000` and `8765`.
+  If the Mission Core process on `8000` is stale, restart that exact canonical
+  service instead of launching another instance.
+- Use `5173` only for an explicitly requested Vite development session and
+  `4173` only for an explicitly requested production preview. Both must proxy
+  the API to `8000`; neither changes the canonical integrated endpoint.
+- Finish with exactly one integrated Mission Core backend on `8000` and no
+  Mission Core backend on `8765`. Open or hand off `8000`, never an alternate
+  backend URL.
+
 ## Component gate
 
 - Reuse package exports from `@nodedc/ui-react`, `@nodedc/ui-core`,
diff --git a/AGENTS.md b/AGENTS.md
index ddfc144..8c23cfc 100644
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -46,6 +46,11 @@ decoders before BLE/Wi-Fi/data-session evidence exists.
   `.codex/skills/mission-core-product-ui/SKILL.md` and follow
   `docs/17_PRODUCT_UI_AND_LAB_PRESENTATION_CANON.md` and
   `docs/18_APPLICATION_COMPONENT_ARCHITECTURE.md`.
+- The integrated Control Station and API have one canonical local endpoint:
+  `http://127.0.0.1:8000`. Never start a second Mission Core backend on another
+  port to bypass a stale process. TCP `8765` is legacy Foxglove regression
+  only, not an operator path. Restart the canonical `8000` process and finish
+  with no Mission Core backend listening on `8765`.
 - `NODEDC_DESIGN_GUIDELINE` is the only visual-design source of truth. Before
   editing UI, read its `registry/registry.json`, `registry/components.json`,
   `registry/icons.json`, and the relevant component documentation.
diff --git a/README.md b/README.md
index d108ed1..1fa777e 100644
--- a/README.md
+++ b/README.md
@@ -307,11 +307,11 @@ export MISSIONCORE_POLYGON_RUNS_ROOT=/mnt/d/NDC_MISSIONCORE/simulation/artifacts
 export MISSIONCORE_POLYGON_WORKER_SOCKET=/run/missioncore-sim/worker.sock
 export MISSIONCORE_POLYGON_WORKER_CONTROL=internal-virtual-only
 export MISSIONCORE_COMMIT=<exact-40-character-mission-core-commit>
-uv run uvicorn k1link.web.app:app --host 127.0.0.1 --port 8765
+uv run k1link serve
 ```
 
 ```text
-http://127.0.0.1:8765/
+http://127.0.0.1:8000/
 ```
 
 The direct `?workspace=polygon-run&run=<qualification-run-id>` URL remains a
@@ -322,6 +322,11 @@ commit. Missing configuration, transport drift and corrupt evidence fail
 closed. The browser receives no Unix socket, D root, artifact bytes, PX4
 endpoint or direct provider command.
 
+Do not launch a second integrated backend on another port when `8000` is
+already occupied. Stop or restart the stale Mission Core process on `8000`.
+TCP `8765` remains reserved for the legacy Foxglove regression module and is
+not a Control Station operator path.
+
 See the [Polygon product/SRS](docs/12_SIMULATION_POLYGON_PRODUCT_AND_SRS.md),
 [ADR 0015](docs/adr/0015-simulation-polygon-qualification-boundary.md),
 [ADR 0016](docs/adr/0016-distributed-product-edge-and-worker-topology.md),
diff --git a/docs/runbooks/SIM_S1C_LIVE_WORKER.md b/docs/runbooks/SIM_S1C_LIVE_WORKER.md
index 21e2dde..0b63257 100644
--- a/docs/runbooks/SIM_S1C_LIVE_WORKER.md
+++ b/docs/runbooks/SIM_S1C_LIVE_WORKER.md
@@ -114,15 +114,20 @@ export MISSIONCORE_POLYGON_RUNS_ROOT=/mnt/d/NDC_MISSIONCORE/simulation/artifacts
 export MISSIONCORE_POLYGON_WORKER_SOCKET=/run/missioncore-sim/worker.sock
 export MISSIONCORE_POLYGON_WORKER_CONTROL=internal-virtual-only
 export MISSIONCORE_COMMIT=<exact-40-character-commit>
-uv run uvicorn k1link.web.app:app --host 127.0.0.1 --port 8765
+uv run k1link serve
 ```
 
 Open the Control Station:
 
 ```text
-http://127.0.0.1:8765/
+http://127.0.0.1:8000/
 ```
 
+The integrated backend has one canonical local endpoint. If `8000` is occupied
+by a stale Mission Core process, restart it; do not launch a second backend on
+an alternate port. TCP `8765` is reserved for the legacy Foxglove regression
+module and is not an operator path.
+
 After Mission Core confirms the worker, `Полигон` must appear in the header and
 open the implemented Polygon workspace directly. The legacy
 `?workspace=polygon-run[&run=<qualification-run-id>]` URL redirects to