Merge branch 'codex/simp-ui-identity-residue' into codex/simp-hide-concrete-agent-loop

# Conflicts:
#	packages/core/agent-loop/README.md

docs/config-catalog.md

@@ -119,6 +119,8 @@ export interface Config {
   agents: (AgentOptions & {
     /** Stable config label used in logs and as the fresh combined-id prefix. */
     id: string
+    /** Optional exact identity for a fresh session; absent lets the loop mint one from the label. */
+    sessionId?: SessionId
     /** Optional workspace for a fresh session. */
     cwd?: string
     /** Persisted session to resume instead of creating a fresh session. */
@@ -645,7 +647,7 @@ export interface Config {
 
 Depends on: [`agentCore`](../packages/core/agent-core/src/index.ts) · [`ToolsConfig`](#deepseek-aidsh-tools)
 
-Source: [`packages/ui/stdio-agent/src/index.ts:64`](../packages/ui/stdio-agent/src/index.ts)
+Source: [`packages/ui/stdio-agent/src/index.ts:65`](../packages/ui/stdio-agent/src/index.ts)
 
 ## `@deepseek-ai/dsh-subagent-acp`