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/dev.py

@@ -0,0 +1,13 @@
+from .base import *  # noqa: F403
+
+DEBUG = True
+ALLOWED_HOSTS = ["*"]
+
+# SQLite by default for zero-deps local shell; override with DATABASE_URL.
+EMAIL_BACKEND = "django.core.mail.backends.console.EmailBackend"
+
+STORAGES = {
+    "staticfiles": {
+        "BACKEND": "django.contrib.staticfiles.storage.StaticFilesStorage",
+    },
+}