list opencode sessions from every project, not just the serve's own

An opencode session in a git directory never appeared in /chat. The list read GET /session,
which answers for ONE project — the one the request's directory resolves to, and with no
x-opencode-directory header that is the serve's own cwd, DATA_PATH/opencode_server. Not a git
checkout, so it resolves to the catch-all project `global`, along with every other non-git
directory. That is why the default chat dir listed fine and nothing looked broken: a cwd that
IS a checkout gets its own project, and chat pwds are checkouts.

Measured on the live serve before changing anything: /session returned 8 sessions, /api/session
13, the five missing ones being an old project's. A session created in a git directory came back
0 times from /session and 1 from /api/session.

/api/session spans projects, so that is now the list. The per-id reads stay on /session — they
answer for any session regardless of project, verified 200 with and without the header.

The trap, and the reason listSessions normalises rather than returning the response: the two
surfaces disagree in silence. /session carries the working directory as top-level `directory`,
/api/session as `location.directory` with no top-level field, inside a {data: …} envelope.
Swapping the endpoint without the mapping leaves `directory` undefined on every session, which
the cwd filter turns into an empty list — the same shape as the metadata.officer.cwd bug this
filter already had once.

Verified against the live serve: with the mapping, a session in a git directory and one in the
general chat dir both resolve to their cwd, and every session carries a directory.

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

src/servers/api/chat/chat.ts

@@ -32,7 +32,8 @@ export const chatRouter = createRouter();
 
 // The working directory a request operates on: an explicit ?cwd= (a chosen pwd), else the default
 // general_chat_sessions dir. Claude groups sessions by cwd, so this selects which project group we read.
-// (OpenCode sessions all live in the one fixed server and ignore cwd.)
+// OpenCode runs on one fixed serve, but each session records the directory its turn ran in, so cwd
+// selects there too.
 const cwdOf = (ctx: Context, email: string): string => ctx.req.query('cwd')?.trim() || getGeneralChatSessionsCwd(email);
 
 // GET /chat/pwds — the default /chat dir plus every directory that already has Claude sessions.