test: adapt consumers to the cache's own root tree

The web e2e seeds no longer warm the deleted coldSnapshot; assertions do not
depend on the cache path. list-children mounts the cache with a scratch
root instead of a storage-domain backend, and drops the now-unused storage
devDependencies.

apps/web/tests/agent-preset-selection.e2e.ts

@@ -134,7 +134,6 @@ async function seedSubagent(scaffold: WebScaffold, parentId: SessionId): Promise
       data: { turn: 1, reason: { kind: 'completed' } },
     },
   ] as SessionEvent[])
-  await scaffold.ctx.sessionProjectionCache.coldSnapshot(header)
 }
 
 /**

apps/web/tests/subagent-conversation.e2e.ts

@@ -155,7 +155,6 @@ describe('web e2e: persisted subagent conversation and human continuation', () =
         data: { turn: 1, reason: { kind: 'completed' } },
       },
     ] as SessionEvent[])
-    await scaffold.ctx.sessionProjectionCache.coldSnapshot(oneShotHeader)
     grandchildId = sessionId('recorded-grandchild')
     const authoredAt = Date.now()
     const grandchildHeader: SessionHeader = {
@@ -200,7 +199,6 @@ describe('web e2e: persisted subagent conversation and human continuation', () =
         data: { turn: 1, reason: { kind: 'completed' } },
       },
     ] as SessionEvent[])
-    await scaffold.ctx.sessionProjectionCache.coldSnapshot(grandchildHeader)
     expect(scaffold.ctx.agents.get(childId)).toBeUndefined()
     expect(scaffold.ctx.agents.get(oneShotId)).toBeUndefined()
     expect(scaffold.ctx.agents.get(grandchildId)).toBeUndefined()

packages/subagent/subagent/package.json

@@ -96,8 +96,6 @@
     "@deepseek-ai/dsh-session-persistence": "workspace:^",
     "@deepseek-ai/dsh-session-projection": "workspace:^",
     "@deepseek-ai/dsh-session-projection-cache": "workspace:^",
-    "@deepseek-ai/dsh-storage": "workspace:^",
-    "@deepseek-ai/dsh-storage-domain": "workspace:^",
     "@deepseek-ai/dsh-jobs": "workspace:^",
     "@deepseek-ai/dsh-tools": "workspace:^",
     "@deepseek-ai/dsh-user-approval": "workspace:^",

packages/subagent/subagent/tests/list-children.spec.ts

@@ -13,9 +13,6 @@ import JsonlSessionPersistence from '@deepseek-ai/dsh-session-persistence-jsonl'
 import SessionProjectionRegistry from '@deepseek-ai/dsh-session-projection'
 import type { ProjectionDefinition } from '@deepseek-ai/dsh-session-projection'
 import SessionProjectionCache from '@deepseek-ai/dsh-session-projection-cache'
-import Storage from '@deepseek-ai/dsh-storage'
-import { DomainFacility } from '@deepseek-ai/dsh-storage-domain'
-import { MemoryMediaPool, MemoryStorageBackend } from '../../../storage/storage-domain/tests/helpers/memory-backend.ts'
 import SubagentRuntime, {
   SUBAGENT_DESCRIPTOR_VERSION,
   SubagentError,
@@ -27,7 +24,10 @@ import { MockAdapter, textResponse } from '../../../core/agent-loop/tests/mock-a
 type Script = ConstructorParameters<typeof MockAdapter>[0]
 
 const roots: string[] = []
+const projCacheRoots: string[] = []
+
 afterEach(() => {
+  for (const root of projCacheRoots.splice(0)) rmSync(root, { recursive: true, force: true })
   for (const root of roots.splice(0)) rmSync(root, { recursive: true, force: true, maxRetries: 10, retryDelay: 100 })
 })
 
@@ -44,12 +44,9 @@ async function setup(
   await ctx.plugin(AgentLoop, { agents: [] })
   if (options.sessionProjections !== false) await ctx.plugin(SessionProjectionRegistry)
   if (options.projectionCache === true) {
-    await ctx.plugin(Storage)
-    ctx.storage.backend.register('memory', new MemoryStorageBackend(new MemoryMediaPool()))
-    const facility = new DomainFacility(ctx, { backend: 'memory', routes: {} })
-    ctx.storage.mount('domain', facility)
-    ctx.provide('storageDomain', facility)
-    await ctx.plugin(SessionProjectionCache, { writeEveryEvents: 100, writeIntervalMs: 60_000 })
+    const root = mkdtempSync(join(tmpdir(), 'dsh-subagent-projcache-'))
+    projCacheRoots.push(root)
+    await ctx.plugin(SessionProjectionCache, { root, writeEveryEvents: 100, writeIntervalMs: 60_000 })
   }
   await ctx.plugin(SubagentRuntime)
   await ctx.plugin(SubagentSpawn, { providerName: 'spawn' })