Add app home Spaces shell and session diagnostics profile menu

Post-login lands on Spaces empty state instead of a principal dump.
Profile menu exposes Session details with identity, tenant, roles/groups,
and authz diagnostics for operator refinement (CSOC-WP-0004 T01/T07).

coulomb_social/apps/core/context_processors.py

@@ -1,10 +1,16 @@
 from django.conf import settings
 
+from coulomb_social.apps.core.principal import display_name_for
+
 
 def site_context(request):
-    return {
+    ctx = {
         "site_name": "coulomb.social",
         "default_tenant_id": settings.DEFAULT_TENANT_ID,
         "oidc_enabled": settings.OIDC_ENABLED,
         "registration_enabled": bool(settings.NETKINGDOM_REGISTRATION_URL),
+        "nav_display_name": "",
     }
+    if getattr(request, "user", None) is not None and request.user.is_authenticated:
+        ctx["nav_display_name"] = display_name_for(request)
+    return ctx

coulomb_social/apps/core/principal.py

@@ -0,0 +1,75 @@
+"""Build principal/session diagnostic dicts for templates (no secrets)."""
+
+from __future__ import annotations
+
+from typing import Any
+
+from django.http import HttpRequest
+
+from coulomb_social.apps.identity import flex_auth
+
+
+def display_name_for(request: HttpRequest) -> str:
+    member = getattr(request.user, "member", None)
+    if member and member.display_name:
+        return member.display_name
+    return request.user.get_full_name() or request.user.get_username()
+
+
+def build_principal(request: HttpRequest, *, authz_resource_id: str = "app_home") -> dict[str, Any]:
+    """Principal card fields + optional session claim diagnostics."""
+    member = getattr(request.user, "member", None)
+    subject = member.subject if member else request.user.get_username()
+    tenant = member.tenant_id if member else ""
+    decision = flex_auth.check(
+        "shell:view",
+        resource="shell",
+        resource_id=authz_resource_id,
+        subject=subject,
+        tenant=tenant,
+        attributes={
+            "issuer": member.issuer if member else "",
+            "user_engine_user_id": str(member.user_engine_user_id) if member else "",
+        },
+    )
+    groups = request.session.get("identity_groups") or []
+    roles = request.session.get("identity_roles") or []
+    assurance = request.session.get("identity_assurance") or {}
+    return {
+        "username": request.user.get_username(),
+        "display_name": display_name_for(request),
+        "email": (member.email if member else "") or request.user.email or "",
+        "issuer": member.issuer if member else "",
+        "subject": member.subject if member else "",
+        "user_engine_user_id": str(member.user_engine_user_id) if member else "",
+        "tenant_id": member.tenant_id if member else "",
+        "user_engine_source": request.session.get("user_engine_source", ""),
+        "principal_type": request.session.get("identity_principal_type", "") or "—",
+        "groups": groups,
+        "roles": roles,
+        "groups_display": ", ".join(str(g) for g in groups) if groups else "—",
+        "roles_display": ", ".join(str(r) for r in roles) if roles else "—",
+        "assurance": assurance,
+        "assurance_display": _format_assurance(assurance),
+        "authz_decision_id": decision.decision_id,
+        "authz_reason": decision.reason,
+        "authz_allow": decision.allow,
+        "member": member,
+        "decision": decision,
+    }
+
+
+def _format_assurance(assurance: dict[str, Any]) -> str:
+    if not assurance:
+        return "—"
+    aal = assurance.get("aal") or assurance.get("acr") or ""
+    methods = assurance.get("methods") or []
+    mfa = assurance.get("mfa")
+    parts: list[str] = []
+    if aal:
+        parts.append(str(aal))
+    if methods:
+        parts.append("methods=" + ",".join(str(m) for m in methods))
+    if mfa is not None:
+        parts.append(f"mfa={mfa}")
+    return "; ".join(parts) if parts else str(assurance)

coulomb_social/apps/core/urls.py

@@ -7,4 +7,5 @@ app_name = "core"
 urlpatterns = [
     path("", views.landing, name="landing"),
     path("app/", views.app_home, name="app_home"),
+    path("account/session/", views.account_session, name="account_session"),
 ]

coulomb_social/apps/core/views.py

@@ -1,61 +1,51 @@
 from django.contrib.auth.decorators import login_required
 from django.http import HttpRequest, HttpResponse, HttpResponseForbidden, JsonResponse
-from django.shortcuts import render
+from django.shortcuts import redirect, render
 
-from coulomb_social.apps.identity import flex_auth
+from .principal import build_principal
 
 
 def landing(request: HttpRequest) -> HttpResponse:
     if request.user.is_authenticated:
-        from django.shortcuts import redirect
-
         return redirect("core:app_home")
     return render(request, "core/landing.html")
 
 
 @login_required
 def app_home(request: HttpRequest) -> HttpResponse:
-    member = getattr(request.user, "member", None)
-    subject = member.subject if member else request.user.get_username()
-    tenant = member.tenant_id if member else ""
-    decision = flex_auth.check(
-        "shell:view",
-        resource="shell",
-        resource_id="app_home",
-        subject=subject,
-        tenant=tenant,
-        attributes={
-            "issuer": member.issuer if member else "",
-            "user_engine_user_id": str(member.user_engine_user_id) if member else "",
-        },
-    )
-    if not decision.allow:
+    principal = build_principal(request, authz_resource_id="app_home")
+    if not principal["authz_allow"]:
         return HttpResponseForbidden(
-            f"Not authorized to view shell ({decision.reason})."
+            f"Not authorized to view shell ({principal['authz_reason']})."
         )
 
+    # Spaces list is empty until CSOC-WP-0004-T02; keep the product empty-state.
+    spaces: list[dict] = []
     return render(
         request,
         "core/app_home.html",
         {
-            "member": member,
-            "principal": {
-                "username": request.user.get_username(),
-                "display_name": (
-                    member.display_name
-                    if member and member.display_name
-                    else request.user.get_full_name() or request.user.get_username()
-                ),
-                "issuer": member.issuer if member else "",
-                "subject": member.subject if member else "",
-                "user_engine_user_id": (
-                    str(member.user_engine_user_id) if member else ""
-                ),
-                "tenant_id": member.tenant_id if member else "",
-                "user_engine_source": request.session.get("user_engine_source", ""),
-                "authz_decision_id": decision.decision_id,
-                "authz_reason": decision.reason,
-            },
+            "principal": principal,
+            "display_name": principal["display_name"],
+            "spaces": spaces,
+        },
+    )
+
+
+@login_required
+def account_session(request: HttpRequest) -> HttpResponse:
+    """Principal / session diagnostics (profile menu → T07)."""
+    principal = build_principal(request, authz_resource_id="account_session")
+    if not principal["authz_allow"]:
+        return HttpResponseForbidden(
+            f"Not authorized to view session details ({principal['authz_reason']})."
+        )
+    return render(
+        request,
+        "core/account_session.html",
+        {
+            "principal": principal,
+            "display_name": principal["display_name"],
         },
     )