## Release v0.51.236 — Release HD (stage-q7)
First Phase 3 (deep-review) release — picked by the 3-factor framework (contributor × impact × mitigated-risk): high-impact (#1952 native Windows support), backend-only (no screenshots), well-mitigated risk (POSIX path provably unchanged), from a contributor active this session (@rodboev, #3446/#3486 shipped earlier today).
### Added
| PR | Author | Fix |
|----|--------|-----|
| #1952 | @rodboev | Native Windows support for `bootstrap.py` + the embedded terminal: POSIX-only `fcntl`/`termios`/`select` guarded behind `_TERMINAL_SUPPORTED`; terminal entry points raise `NotImplementedError`/no-op on Windows; bootstrap Windows block → warning; auto-install errors clearly on native Windows (WSL unaffected); foreground uses `Popen`+exit on Windows instead of `os.execv`. **POSIX behavior unchanged on every path.** |
### Absorbed on the way in (fix-it-ourselves, reviewed fresh)
- `subprocess.CREATE_NEW_PROCESS_GROUP` → `getattr(subprocess, ..., 0)` — the constant is Windows-only, so a win32-simulating test `AttributeError`'d on Linux. Mirrors the `SO_EXCLUSIVEADDRUSE` getattr guard.
- Fixed 2 over-reaching tests in `test_windows_native_support.py` — one was launching a **real installer subprocess** via an unstubbed `subprocess.run` (now stubbed; harness 2.8s vs 80s); removed unused imports.
- Updated `test_onboarding_static.py` — it asserted the OLD "Native Windows is not supported" hard-block string this PR intentionally replaces; now asserts the new experimental-warning + auto-install guard.
- Help-text accuracy: `--foreground` help now describes the Windows Popen path (Opus nit).
### Gate results
- **Full pytest suite**: 7478 passed, 9 skipped, 3 xpassed, **0 failed**
- **ruff forward gate**: CLEAN
- **browser-smoke gate**: CLEAN (gate hardened mid-release to auto-detect the cached chromium revision)
- **Codex (regression)**: SAFE TO SHIP (simulated `sys.platform=win32`, verified POSIX modules not imported + all terminal guards complete + POSIX foreground still uses execv)
- **Opus (correctness)**: SAFE TO SHIP (POSIX path provably unchanged, all fcntl/termios/select guarded, Popen+exit correct; noted inherent-Windows trade-offs that aren't PR bugs)
Note: the Windows *runtime* path can't be executed on the Linux CI box; it was reviewed statically by both reviewers + the contributor's 209-line test (win32 simulated via monkeypatch). Linux/POSIX no-regression is fully verified.
Closes#1952.
Co-authored-by: rodboev <rodboev@users.noreply.github.com>
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