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

# Conflicts:
#	packages/host/apiproxy/tests/api-proxy-agent-preset.spec.ts

packages/host/apiproxy/src/api-proxy.ts

@@ -1179,30 +1179,6 @@ export function createApiProxy(ctx: Context, defaults: ApiProxyDefaults): ApiPro
     return undefined
   }
 
-  /**
-   * The agent whose layer holds this session's tool presenters.
-   *
-   * A preset registers its tools into the agent's OWN layer, so a transcript
-   * read while no agent exists finds no presenter at all and every card
-   * degrades to the generic renderer — silently, because a viewless entry is
-   * also what a tool with no presenter produces. Reading therefore resolves
-   * the agent, through the same deduplicated resume every other session method
-   * takes, whenever a roster is composed.
-   *
-   * A deployment composing no roster keeps the storage-only read it always
-   * had: its tools are in the host layer, which needs no agent to address. A
-   * resolution failure is not a read failure either — the transcript still
-   * serves, with the generic cards it would have rendered anyway.
-   * @param sessionId - the transcript being read.
-   * @returns the agent to resolve presenters against, or undefined for none.
-   */
-  async function presenterAgentFor(sessionId: SessionId): Promise<Agent | undefined> {
-    const live = ctx.get('agents')?.get(sessionId)
-    if (live !== undefined || ctx.get('agentPresets') === undefined) return live
-    const found = await agentFor(sessionId)
-    return 'error' in found ? undefined : found.agent
-  }
-
   /** Read one transcript cut and optional projection baseline without acquiring an Agent owner. */
   async function historyStateFor(
     sessionId: SessionId,
@@ -1823,7 +1799,11 @@ export function createApiProxy(ctx: Context, defaults: ApiProxyDefaults): ApiPro
             details: {},
           })
         }
-        const page = historyPage(ctx, state.events, beforeSeq, maxMessages, await presenterAgentFor(sessionId))
+        // `ctx.get`, not `ctx.agents`: this is the COLD path, and a caller may
+        // serve history from storage with no agent registry composed at all.
+        // An absent registry means no live agent, which is the same answer a
+        // present one gives here — presenters fall back to the global layer.
+        const page = historyPage(ctx, state.events, beforeSeq, maxMessages, ctx.get('agents')?.get(sessionId))
         return ok(request, {
           events: page.events,
           hasMore: page.hasMore,