feat: help agents find stories and experiences on their own

Search matches query terms (CJK pairs) instead of only the whole phrase, previews show readable fields first, and the tool description says when to call it and when to stop.

src/main/assistant/supervision-story-suggestions.test.ts

@@ -9,6 +9,7 @@ import { AssistantDatabase } from './assistant-database'
 import { extractExperiences } from './supervision-experiences'
 import { assignStories } from './supervision-stories'
 import { deriveSuggestions } from './supervision-suggester'
+import { queryTerms } from './story-graph-reader'
 
 const cleanups: Array<() => Promise<void>> = []
 afterEach(async () => { for (const cleanup of cleanups.splice(0)) await cleanup() })
@@ -135,6 +136,17 @@ it('lets agents search stories and experiences and read their events through the
   expect((f.db.readStoryGraph('story_graph_search', { query: 'long jobs', object_types: ['experience'] }, other.id) as Page).items).toEqual([])
 })
 
+it('matches multi-word and Chinese queries by terms, ranking stories and experiences first', async () => {
+  expect(queryTerms('监督者回顾调度')).toEqual(['监督', '督者', '者回', '回顾', '顾调', '调度'])
+  expect(queryTerms('review pause 300s, a')).toEqual(['review', 'pause', '300s'])
+  const f = await fixture()
+  await f.publish('Review scheduling', ['Pause after 300 seconds', 'Users clicked continue repeatedly', 'Run until complete'], '2026-09-20')
+  type Page = { items: Array<{ object_ref: { type: string } }> }
+  // No stored text contains the whole phrase; enough of its words do.
+  const hits = f.db.readStoryGraph('story_graph_search', { query: 'review scheduling decision', page_size: 5 }, f.project.id) as Page
+  expect(hits.items[0]!.object_ref.type).toBe('story')
+  expect((f.db.readStoryGraph('story_graph_search', { query: 'billing invoices tax', page_size: 5 }, f.project.id) as Page).items).toEqual([])
+})
 it('upgrades schema 55 suggestions to 56 without losing rows', async () => {
   const directory = await mkdtemp(join(tmpdir(), 'goodbuddy-suggestions-56-'))
   const path = join(directory, 'assistant.sqlite')