feat: add standards wiki, MCP registry, and app template

standards_src/wiki/10_testing.md

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+# Testing
+
+## Summary
+
+Two test suites: **integration** (the HTTP edge with fakes) and **unit** (pure
+domain and pipeline logic). Both run under pytest with asyncio auto mode.
+
+---
+
+## Layout
+
+```
+tests/
+    integration/     # TestClient(app) + mocked resources
+    unit/            # models, converters, pipeline stages/roots
+    conftest.py      # fixtures
+```
+
+## Integration tests
+
+- Build the app with `TestClient`.
+- Replace `app.state.resources` with fake repositories/services so no database
+  is required.
+- Patch the auth introspection call (`httpx.AsyncClient.post`) to return a
+  canned identity.
+- Assert status codes and bodies for list/get/create/update/delete, plus
+  `400`, `404`, `204`, and the streaming endpoint's fallback.
+
+```python
+client = TestClient(app)
+app.state.resources = {"item_svc": FakeItemService(), ...}
+
+def test_create_item():
+    r = client.post("/items", json={"name": "x"})
+    assert r.status_code == 200
+```
+
+## Unit tests
+
+- Domain models and converters: pure, no I/O.
+- Pipeline stages: feed a fixture state, assert the transformed state.
+- Assembled pipeline roots: **fixture parity** — replay a stored fixture input
+  and compare against a golden output file.
+
+## Config-consistency tests
+
+For rule-driven pipelines, add a test that cross-references rules against the
+declared pattern registry: every flag emitted must be defined; every defined
+flag must be reachable. This catches drift without running the pipeline.
+
+## Conventions
+
+- `asyncio_mode = "auto"`; no manual event loops.
+- Fixtures are checked into the repo (inputs + golden outputs).
+- Tests skip (not fail) when a required fixture is absent.
+- Do not mock the domain; mock only the infrastructure edge.