feat(storage): move desktop SQLite ownership into a storage utility process

Main no longer opens desktop business SQLite. A single utility-process
storage owner holds the Assistant, Knowledge, attachment, document-result,
remote-binding and native model-ledger databases and runs whole domain
transactions; Main and Runtime callers use explicit async domain operations.

- Remove the Main readWithFallback path and the supervision worker's
  separate business write connection; manifests are scanned read-only and
  committed by the sole writer.
- Remote events are ACKed only after commit; process loss reports
  unconfirmed writes instead of replaying them.
- Use native utilityProcess messaging with one in-flight bound (32) and
  ordered waiting instead of capacity rejection and retries.
- Start the storage process before the window so startup overlaps.
- Keep short tool output in memory and store full output once in owned
  storage; paging, branching, restart and deletion reuse that copy.
- Put required runtime launch files under goodbuddy-prefixed owned temp
  directories and reclaim confirmed stale ones; stop writing duplicate
  parsed.md.
- Add lint guards for SQLite ownership and architecture, concurrency
  acceptance fixtures, and maintenance/architecture documentation.

Validation: typecheck and lint pass. Alternating baseline (edf019aa) vs
candidate runs show no regression on single-session, C01, C02, C04 and a
5-minute C06; Main p99 drops from ~21 ms to ~16.7 ms under concurrency.
Fresh portable copy (1.75M events) upgrade content unchanged; real-model
output paging passes with 4 external requests. Full npm test runs had
1-9 different timing-sensitive failures per run that pass when rerun.
Not covered: C03 review publication, C07 source body, app-level C05.

src/main/agent/ripgrep-provider.test.ts

@@ -1,13 +1,19 @@
-import { mkdtemp, rm, writeFile } from 'node:fs/promises'
+import { mkdir, mkdtemp, rm, writeFile } from 'node:fs/promises'
 import { tmpdir } from 'node:os'
 import { join } from 'node:path'
 import { rgPath } from '@vscode/ripgrep'
 import { expect, it } from 'vitest'
+import { FileOutputBacking, outputFixtureRoot } from '../../../tests/support/paged-output-backing'
 import { ModelToolProvider, type ModelToolResult } from './model-tool-provider'
 
 it('pages native rg output through the production provider and releases it', async () => {
+  await mkdir(outputFixtureRoot, { recursive: true })
   const root = await mkdtemp(join(tmpdir(), 'goodbuddy-rg-provider-'))
-  const provider = new ModelToolProvider(root, [], undefined, undefined, false, { ripgrepExecutablePath: rgPath })
+  const backingStore = new FileOutputBacking()
+  const provider = new ModelToolProvider(root, [], undefined, undefined, false, {
+    ripgrepExecutablePath: rgPath,
+    outputStore: { backingStore }
+  })
   const context = { conversationId: 'rg-pages', runtimeTarget: 'model' as const,  }
   const signal = new AbortController().signal
   const parse = (result: ModelToolResult) => {
@@ -45,6 +51,7 @@ it('pages native rg output through the production provider and releases it', asy
     await expect(provider.callTool('output_read', { handle: reference.handle }, signal, context)).rejects.toThrow('不存在')
   } finally {
     await provider.dispose()
+    await backingStore.dispose()
     await rm(root, { recursive: true, force: true })
   }
 })