Implement NetKingdom identity shell for coulomb.social (CSOC-WP-0002)

Django scaffold aligned with the business delivery lane: tenant-keyed
Member model without passwords, identity app as sole OIDC/session
boundary, dev-claims login, authenticated /app/ shell, ADR-0001, and
tests. T01/T02/T05/T06 done; OIDC registration, real user-engine HTTP,
flex-auth, and packaging remain open.

coulomb_social/settings/test.py

@@ -0,0 +1,23 @@
+from .base import *  # noqa: F403
+
+DEBUG = False
+SECRET_KEY = "test-secret-key"
+PASSWORD_HASHERS = ["django.contrib.auth.hashers.MD5PasswordHasher"]
+
+DATABASES = {
+    "default": {
+        "ENGINE": "django.db.backends.sqlite3",
+        "NAME": ":memory:",
+    }
+}
+
+OIDC_ENABLED = False
+USER_ENGINE_BASE_URL = ""
+FLEX_AUTH_BASE_URL = ""
+
+# Whitenoise manifest not required in tests
+STORAGES = {
+    "staticfiles": {
+        "BACKEND": "django.contrib.staticfiles.storage.StaticFilesStorage",
+    },
+}