fix: address review round two

- listChildren contains per-child projection faults on both ladder rungs
  (any registered unit's fold/schema rejection maps to that child's corrupt
  diagnostic) and pins the whole-enumeration listing-failure rethrow
- the base bundle mounts session-projection (web-app's own insert retired
  to avoid the double mount); stale composition comment updated
- the shared projections-unavailable wire face is pinned across
  list/history/prompt; retired session-query arms removed from the catalog
  paths
- the design note records the unknown-parent semantics shift and the
  fold-fault isolation rule

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

@@ -609,23 +609,12 @@ async function catalogChild(
     }
     return { entry }
   } catch (error: unknown) {
-    if (signal?.aborted
-      || (error instanceof SubagentError && error.code === 'CANCELLED')
-      || (error instanceof SessionQueryError && error.code === 'SESSION_QUERY_ABORTED')) {
+    if (signal?.aborted || (error instanceof SubagentError && error.code === 'CANCELLED')) {
       return { error: { code: 'cancelled', message: 'subagent catalog read was cancelled', details: {} } }
     }
     if (error instanceof SubagentError && error.code === 'SUBAGENT_CONTROL_PROJECTIONS_UNAVAILABLE') {
       return { error: projectionsUnavailableError() }
     }
-    if (error instanceof SessionQueryError && error.code === 'SESSION_QUERY_SESSION_NOT_FOUND') {
-      return {
-        error: {
-          code: 'subagent-not-found',
-          message: `parent session "${parentSessionId}" was not found`,
-          details: { parentSessionId, childSessionId },
-        },
-      }
-    }
     return { error: { code: 'internal', message: 'subagent catalog read failed', details: {} } }
   }
 }
@@ -1903,9 +1892,7 @@ export function createApiProxy(ctx: Context, defaults: ApiProxyDefaults): ApiPro
             parentAvailable: ctx.agents.get(request.payload.parentSessionId) !== undefined,
           })
         } catch (error: unknown) {
-          if (signal?.aborted
-            || (error instanceof SubagentError && error.code === 'CANCELLED')
-            || (error instanceof SessionQueryError && error.code === 'SESSION_QUERY_ABORTED')) {
+          if (signal?.aborted || (error instanceof SubagentError && error.code === 'CANCELLED')) {
             return err(request, {
               code: 'cancelled',
               message: 'subagent catalog read was cancelled',

packages/host/apiproxy/tests/api-proxy-subagents.spec.ts

@@ -157,6 +157,33 @@ describe('subagent gateway', () => {
     expect(readSession).not.toHaveBeenCalled()
   })
 
+  it('maps the missing projections capability to one wire face on list, history, and prompt', async () => {
+    const listError = () => new SubagentError(
+      'listing subagents requires the sessionProjections registry (load @deepseek-ai/dsh-session-projection)',
+      'SUBAGENT_CONTROL_PROJECTIONS_UNAVAILABLE',
+    )
+    const expected = {
+      code: 'internal',
+      message: 'subagent listing is unavailable: this deployment does not mount the sessionProjections registry (load @deepseek-ai/dsh-session-projection)',
+    }
+
+    const list = bench({ listError: listError() })
+    expect((await list.api.subagents.list(request({ parentSessionId: PARENT }))).result)
+      .toMatchObject({ ok: false, error: expected })
+
+    const history = bench({ listError: listError() })
+    expect((await history.api.subagents.history(request({
+      parentSessionId: PARENT, childSessionId: CHILD, mode: 'continuable',
+    }))).result).toMatchObject({ ok: false, error: expected })
+    expect(history.readSession).not.toHaveBeenCalled()
+
+    const prompt = bench({ listError: listError() })
+    expect((await prompt.api.subagents.prompt(request({
+      parentSessionId: PARENT, childSessionId: CHILD, mode: 'continuable', content: [],
+    }), new AbortController().signal)).result).toMatchObject({ ok: false, error: expected })
+    expect(prompt.followup).not.toHaveBeenCalled()
+  })
+
   it('routes human content through the exact live parent with rpc attribution', async () => {
     const { api, parent, followup } = bench()
     const content = [{ type: 'text' as const, text: '继续' }]