Merge branch 'stack/agent-profiles-5-web-ui' into stack/agent-profiles-8-authoring

The composer's preset seat stays removed here — this layer moved it to the
hero chip and the session-header action — so only the model seat takes the
`modelSeatLocked` narrowing master introduced.

Conflicts:
	apps/web/tests/snapshots/*/*.expected.md
	packages/client/connection/README.md
	packages/client/connection/README.zh.md
	packages/client/ui-conversation/src/client/skeleton/InputBar.tsx
	packages/host/apiproxy/src/fetch/client.ts

tsconfig.host.json

@@ -9,6 +9,7 @@
   },
   "include": [
     "apps/web/tests/scaffold.ts",
+    "apps/web/tests/default-model.e2e.ts",
     "apps/web/tests/support.ts",
     "apps/web/tests/scaffold-hermetic.e2e.ts",
     "apps/web/tests/core-web-profile.snapshot.ts",
@@ -49,6 +50,7 @@
     "apps/web/tests/shipped-composition.e2e.ts",
     "apps/web/tests/goal-bar.e2e.ts",
     "apps/web/tests/startup-auto-selection.e2e.ts",
+    "apps/web/tests/produced-files.e2e.ts",
     "apps/web/tests/subagent-conversation.e2e.ts",
     "apps/web/tests/bash-abort-row.e2e.ts",
     "apps/web/tests/skill-tool-row.e2e.ts",
@@ -90,6 +92,7 @@
     { "path": "./vendor/hmr" },
     { "path": "./vendor/logger-console" },
     { "path": "./packages/util/brand" },
+    { "path": "./packages/util/environment" },
     { "path": "./packages/util/native-command" },
     { "path": "./packages/util/paths" },
     { "path": "./packages/util/timeout" },
@@ -99,7 +102,10 @@
     { "path": "./packages/llm/token-meter" },
     { "path": "./packages/core/session" },
     { "path": "./packages/core/scope" },
+    { "path": "./packages/typert/type-meta" },
     { "path": "./packages/typert/registry" },
+    { "path": "./packages/api/gateway" },
+    { "path": "./packages/api/remotes/tsconfig.host.json" },
     { "path": "./packages/typert/loader" },
     { "path": "./packages/session-persistence/session-persistence" },
     { "path": "./packages/session-persistence/session-checkpoint-policy" },