Merge remote-tracking branch 'origin/stack/agent-profiles-3-wire' into stack/agent-profiles-5-web-ui

# Conflicts:
#	docs/architecture.i18n.yaml
#	docs/architecture.zh.md
#	docs/module-graph.md
#	packages/host/apiproxy/src/api-proxy.ts
#	scripts/verify-package-readme-model-experience.ts

packages/bundle/web-app/cordis.patch.yml

@@ -72,13 +72,9 @@
       name: '@deepseek-ai/dsh-host-directory-picker-auto'
 
     # The API gateway: the transport-agnostic dispatch face every client shape
-    # shares. provider/model are the host default routing — the profile json's
-    # mapping target (user config overrides these engineering defaults).
+    # shares. The base layer's agent-default-model service owns the default model.
     - id: api-gateway
       name: '@deepseek-ai/dsh-host-apiproxy'
-      config:
-        provider: deepseek-official
-        model: deepseek-v4-flash
 
     # ── layer 2: transport/service ──────────────────────────────────────────────