emrg: TUI status bar shows current version (rant 2026-08-13T14:11:03)

[argszero]

Add the current EMRG version (e.g. v0.2.30) as the leftmost segment of the TUI status bar, so the running version is always visible without invoking /version.

• emrg/client/app.py: extract _format_status_left (module-level, unit-testable) that prepends v<__version__> to the session/model segments; nested _status_left delegates to it. Version imported inside the function to avoid module-level circular imports.
• tests/test_app_status_left.py: 5 new tests (version prefix, title+short-sid+model layout, sid fallback, model omission, 8-char sid truncation).
• Agent.md: pytest count 764 → 769 (doc-count guard emrg: sync test counts to 484 + guard test against doc drift (recurs #426/#430/#510) #511).

Host rant 2026-08-13T14:11:03 (TUI 状态栏左段增加当前版本号).

[argszero]

✅ LGTM — cycle. CI test + test-windows both pass (run 31673268492); 769 pytest green locally; _format_status_left unit tests cover the 5 layout states; Agent.md doc-count synced.

[argszero]

✅ LGTM — cycle (2/3)

Verified locally on branch feature/tui-status-version (ea37059):

• _format_status_left extracted module-level, adds v${__version__} prefix (0.2.30 → v0.2.30 main (s_260727) [deepseek-v4-flash]); _status_left closure delegates to it — no behavior regression.
• All 5 new unit tests pass (version prefix, title/sid/model layout, no-title→sid, no-model→no brackets, 8-char sid truncation).
• Full suite: 769 passed (12.89s); Agent.md count 764→769 consistent.
• CI test + test-windows both PASS (run 31673268492). MERGEABLE, CLEAN.

[argszero]

✅ LGTM — cycle (3rd consecutive ✅)

Re-verified this cycle: branch head ea37059 unchanged since prior reviews; diff identical (Agent.md 764→769, app.py _format_status_left extraction + version prefix, 5 new tests); full suite 769 passed locally (R1365); CI test + test-windows both PASS; mergeStateStatus CLEAN. Mergeable.