fix(cloud): the asleep copy keeps one terminal per tab, not one per boot

Seen on m4air: after two wake/sleep cycles the asleep read-only copy listed 3
terminals for a workspace with one tab. Each boot respawns the tab's terminal
under a new handle and the old handles' cached reads stayed. The copy now keeps
only the terminals the newest whole-workspace terminal.list names (plus any read
after it); a filtered listing never decides, and with no listing all are kept.

src/main/hosted-sandbox/cloud-offline-cache.test.ts

@@ -164,6 +164,66 @@ describe('legacy plaintext cache files', () => {
 })
 
 describe('offline snapshot', () => {
+  it('keeps one terminal per tab across wake/sleep cycles, not one per boot', async () => {
+    const { cache, tick } = setup()
+    // Each boot respawns the tab's terminal under a new handle; every capture lists and reads it.
+    for (const handle of ['boot1', 'boot2', 'boot3']) {
+      cache.record(
+        'env',
+        'terminal.list',
+        { worktree: 'id:w' },
+        ok({ terminals: [{ handle, title: 'zsh' }] })
+      )
+      cache.record(
+        'env',
+        'terminal.read',
+        { terminal: handle, limit: 400 },
+        ok({ terminal: { handle, tail: [`$ on ${handle}`] } })
+      )
+      tick()
+    }
+    // A filtered listing (one tab) never decides which terminals are live.
+    cache.record('env', 'terminal.list', { worktree: 'id:w', tabId: 't' }, ok({ terminals: [] }))
+    tick()
+    const snapshot = await buildOfflineSnapshot(cache, 'env', 'w', true)
+    expect(snapshot.terminals.map((t) => [t.handle, t.lines])).toEqual([['boot3', ['$ on boot3']]])
+  })
+
+  it('keeps a terminal read after the newest listing (opened since), and all with no listing', async () => {
+    const { cache, tick } = setup()
+    cache.record(
+      'env',
+      'terminal.read',
+      { terminal: 'old' },
+      ok({ terminal: { handle: 'old', tail: ['a'] } })
+    )
+    tick()
+    expect((await buildOfflineSnapshot(cache, 'env', 'w', true)).terminals).toHaveLength(1)
+    cache.record(
+      'env',
+      'terminal.list',
+      { worktree: 'id:w' },
+      ok({ terminals: [{ handle: 'h1' }] })
+    )
+    cache.record(
+      'env',
+      'terminal.read',
+      { terminal: 'h1' },
+      ok({ terminal: { handle: 'h1', tail: ['b'] } })
+    )
+    tick()
+    cache.record(
+      'env',
+      'terminal.read',
+      { terminal: 'new' },
+      ok({ terminal: { handle: 'new', tail: ['c'] } })
+    )
+    const handles = (await buildOfflineSnapshot(cache, 'env', 'w', true)).terminals.map(
+      (t) => t.handle
+    )
+    expect(handles.sort()).toEqual(['h1', 'new'])
+  })
+
   it('builds chats, terminals and git state from cached answers', async () => {
     const { cache, tick } = setup()
     cache.record(

src/main/hosted-sandbox/cloud-offline-snapshot.ts

@@ -144,13 +144,35 @@ function chatsOf(entries: OfflineCacheEntry[]): CloudOfflineChat[] {
   return [...bySession.values()].sort((a, b) => b.at - a.at)
 }
 
+/**
+ * The newest `terminal.list` of the whole workspace (the capture's own `{worktree}` call, not a
+ * filtered one) that answered with a terminal list: its handles are the live terminals.
+ */
+function newestWorkspaceListing(
+  lists: readonly OfflineCacheEntry[]
+): { handles: Set<string>; at: number } | null {
+  for (const list of lists) {
+    const params = ParamsSchema.safeParse(list.params)
+    const keys = params.success ? Object.keys(params.data) : []
+    if (keys.length !== 1 || keys[0] !== 'worktree') {
+      continue
+    }
+    const parsed = TerminalListSchema.safeParse(list.result)
+    if (parsed.success && parsed.data.terminals) {
+      return { handles: new Set(parsed.data.terminals.map((t) => t.handle)), at: list.at }
+    }
+  }
+  return null
+}
+
 async function terminalsOf(
   cache: CloudOfflineCache,
   environmentId: string
 ): Promise<CloudOfflineTerminal[]> {
   // Every listing contributes titles (a filtered listing can be empty); newest first wins.
+  const lists = await cache.entries(environmentId, 'terminal.list')
   const titles = new Map<string, string | null>()
-  for (const list of await cache.entries(environmentId, 'terminal.list')) {
+  for (const list of lists) {
     const parsed = TerminalListSchema.safeParse(list.result)
     for (const terminal of parsed.success ? (parsed.data.terminals ?? []) : []) {
       if (!titles.has(terminal.handle)) {
@@ -158,6 +180,10 @@ async function terminalsOf(
       }
     }
   }
+  // Each boot respawns a tab's terminal under a new handle, and reads of the old ones stay cached:
+  // only the terminals the newest whole-workspace listing names are this workspace's terminals
+  // (plus any read after that listing, which it could not know yet). No such listing: keep all.
+  const current = newestWorkspaceListing(lists)
   const seen = new Set<string>()
   const terminals: CloudOfflineTerminal[] = []
   for (const entry of await cache.entries(environmentId, 'terminal.read')) {
@@ -167,6 +193,9 @@ async function terminalsOf(
     if (!handle || seen.has(handle) || !result?.tail) {
       continue
     }
+    if (current && !current.handles.has(handle) && entry.at <= current.at) {
+      continue
+    }
     seen.add(handle)
     terminals.push({
       handle,