Merge remote-tracking branch 'origin/master' into codex/pr-555-ci-fix

# Conflicts:
#	docs/config-catalog.i18n.yaml
#	docs/config-catalog.md
#	docs/config-catalog.zh.md
#	docs/module-graph.i18n.yaml
#	docs/module-graph.md
#	docs/module-graph.zh.md
#	examples/acp-agent/tests/snapshots/cordis-inspect-jsdoc/session.jsonl
#	packages/client/connection/src/client/fixture.ts
#	packages/host/apiproxy/src/api-proxy.ts

packages/host/apiproxy/src/api/sessions.ts

@@ -171,6 +171,13 @@ export interface SessionSummary {
   origin?: 'subagent'
   /** Session working directory (header.cwd passthrough); absent when unrecorded. */
   cwd?: string
+  /**
+   * Agent preset this session's agent was composed from (header passthrough);
+   * absent when the deployment composes no presets. A surface offering a
+   * switch reads this to show what the session actually runs rather than what
+   * the deployment currently defaults to.
+   */
+  agentPreset?: string
   /**
    * Projection baseline for this row, with zero log loads: attached sessions
    * read the registry's live watermark cut; cold sessions read the persisted
@@ -214,9 +221,16 @@ export interface SessionsApi {
    * session, while a different cwd fails with `session-conflict`. Workspace
    * creation attaches the session after publication; an attach failure
    * returns `workspace-attach-failed` with the published session id.
+   *
+   * `agentPreset` names the composition the new session's agent is built
+   * from; omitted, the effective default applies — the user's stored choice
+   * where one exists, else the deployment's own. The resolved id is stored on
+   * the session header, so a later resume rebuilds the same agent. An unknown
+   * id fails with `agent-preset-not-found`, and a preset whose composition
+   * cannot be mounted fails with `agent-preset-invalid`.
    */
-  create(request: RpcRequest<{ workspaceId?: WorkspaceId; cwd?: string; sessionId?: SessionId }>):
-  Promise<RpcResponse<{ sessionId: SessionId }>>
+  create(request: RpcRequest<{ workspaceId?: WorkspaceId; cwd?: string; sessionId?: SessionId; agentPreset?: string }>):
+  Promise<RpcResponse<{ sessionId: SessionId; agentPreset?: string }>>
 
   /**
    * Reads a window of history events; page boundaries align to append-origin message