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/preload/index.ts

@@ -1625,6 +1625,7 @@ const desktopApi: DesktopApi = {
     cancelParsing: (operationId) => ipcRenderer.invoke(ipcChannels.contextCancelParsing, operationId),
     sendOriginal: (conversationId, id) => ipcRenderer.invoke(ipcChannels.contextSendOriginal, { conversationId, id }),
     openOriginal: (id) => ipcRenderer.invoke(ipcChannels.contextOpenOriginal, id),
+    readOutput: (input) => ipcRenderer.invoke(ipcChannels.contextReadOutput, input),
     addResultImages: (conversationId, resultId, imageIds) => ipcRenderer.invoke(ipcChannels.contextAddResultImages, { conversationId, resultId, imageIds }),
     onDraftChanged: (listener) => {
       const handler = (_event: Electron.IpcRendererEvent, conversationId: string, attachments: ContextAttachment[]): void => listener(conversationId, attachments)
@@ -1844,6 +1845,13 @@ const desktopApi: DesktopApi = {
         graphStrategy
       })
     },
+    importPaths: async (libraryId, paths, graphStrategy) => {
+      await ipcRenderer.invoke(ipcChannels.knowledgeImportPaths, {
+        libraryId,
+        paths,
+        graphStrategy
+      })
+    },
     importUrl: async (libraryId, url, graphStrategy) => {
       await ipcRenderer.invoke(ipcChannels.knowledgeImportUrl, {
         libraryId,