read a member's transcripts as the member

a provisioned member could chat normally and had no conversation list. every
refresh came back empty, so nothing could be resumed, and a new chat never
became a saved one.

nothing was wrong with the logic. the turn runs as them, writes its transcript
into their home, and the platform looks in exactly the right place — it just
cannot read what it finds.

confineUserTree grants the service user a named acl entry on every member home,
with d: defaults so anything created later inherits it. that entry is real and
getfacl shows it. it does not survive a file created at mode 600, because posix
derives the acl mask from the group bits of the creation mode:

    user:officer:rwx    #effective:---
    mask::---

claude writes every transcript at exactly that mode — .claude and projects/ are
775, every *.jsonl is 600. so readdir and stat worked, every read raised eacces,
and summarizeTranscript catches eacces and returns null. the sessions did not
fail, they vanished.

no acl can fix this. the creation mode ands the mask down, so d: defaults cannot
raise it, and the only way up is through `other`, which is every account on the
box. a 600 file has two readers: its owner, and root.

so read as the owner of the file, through the same runAsArgv the terminal and
the agent already use. spawnSync keeps it synchronous, which is what lets it
drop into a 914-line synchronous parser reached from five modules instead of
rippling await through all of it.

the privileged surface turned out to be seven call sites, not the file: stat
needs traverse and readdir needs read, and the 775 directories give both. only
content needed identity.

also fixes a 500. parseClaudeTranscript read the file uncaught after an
existsSync that passes, so deep-linking /chat/<id> as a member threw rather than
404ing. it returns null now, like the list path always did.

verified against a throwaway linux account provisioned the same way a member is
— 700 home, named acl, transcript written as them at 600. before: 0 sessions and
loadClaudeSession null. after: the session, its title, its messages, and a
rename that leaves the file owned by the member at 600.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

src/servers/api/chat/chat.ts

@@ -43,7 +43,7 @@ import { readSttConfig } from '../server-settings/stt';
 async function chatIdentity(user: { id: number; email: string }): Promise<ChatIdentity> {
   const resolved = await resolveHomeDir(user.id);
   if (!resolved.ok) throw errors.FORBIDDEN(resolved.reason);
-  return { email: user.email, home: resolved.home };
+  return { email: user.email, home: resolved.home, osUser: resolved.osUser };
 }
 import { transcribeAudio } from '../stt/transcribe';
 import { registerAgentPanelRoutes } from './agent-panels-routes';