Terminal CLI sessions never sync to claude.ai/code; desktop-app sessions on same account do

**Environment:** Claude Code v2.1.277, macOS, two machines (Apple Silicon), Terminal.app. `claude auth status` on both: `authMethod: claude.ai`, `apiProvider: firstParty`, `subscriptionType: max`, same email/org.

**Expected:** Per #78776 and related reports, sessions sync at the account level across CLI, desktop app, and web.

**Actual:** Sessions started with `claude` in a terminal never appear at claude.ai/code, on either machine, even after `/exit`. Sessions launched from the desktop app on the same account appear immediately. The web sidebar shows only desktop/web sessions, the newest a week old.

**Repro:**
1. `claude --debug` in Terminal.app, send one message, `/exit`.
2. Refresh claude.ai/code → session absent.
3. `grep -iE 'sync|upload' ~/.claude/debug/.txt` → no session upload attempt logged at all (only skills/plugins "synced" dir lines), no network errors.
4. Launch a session from the desktop app on the same machine → appears on the web.

**Config:** `~/.claude/settings.json` contains no sync, telemetry, or proxy settings. No `ANTHROPIC_*`, `CLAUDE_*` (other than `CLAUDE_CODE_DISABLE_MOUSE`), or proxy env vars. `analyticsDisabled: false`.

**Ask:** Clarify whether terminal-session sync is a staged rollout. If so, surface that state somewhere (`/status` or `claude doctor`). If it's meant to be live for everyone, this account isn't getting it and the CLI logs nothing indicating why.

**Adjacent UX note:** Voice dictation in the Cowork web composer transcribed an English message as French mid-conversation, with no visible language pin in the UI.

Start with a terminal session launched using `claude --debug`, then inspect the matching file under `~/.claude/debug/` for sync or upload activity. Compare the terminal behavior with a desktop-app session and determine whether rollout status or a diagnostic is available; done means the cause or rollout state is explained and the requested visibility is addressed.

Written by the indexing model from the issue text.