feat(windows): close remaining POSIX-only landmines — TUI crash, kanban waitpid, AF_UNIX sandbox, /bin/bash, npm .cmd shims, cwd tracking, detach flags

Second pass on native Windows support, driven by a systematic audit across
five areas: POSIX-only primitives (signal.SIGKILL/SIGHUP/SIGPIPE, os.WNOHANG,
os.setsid), path translation bugs (/c/Users → C:\Users), subprocess patterns
(npm.cmd batch shims, start_new_session no-op on Windows), subsystem health
(cron, gateway daemon, update flow), and module-level import guards.

Every change is platform-gated — POSIX (Linux/macOS) behaviour is preserved
bit-identical. Explicit "do no harm" test: test_posix_path_preserved_on_linux,
test_posix_noop, test_windows_detach_popen_kwargs_is_posix_equivalent_on_posix.

## New module

- hermes_cli/_subprocess_compat.py — shared helpers (resolve_node_command,
  windows_detach_flags, windows_hide_flags, windows_detach_popen_kwargs).
  All no-ops on non-Windows.

## CRITICAL fixes (would crash or silently break on Windows)

- tui_gateway/entry.py: SIGPIPE/SIGHUP referenced at module top level would
  AttributeError on import on Windows, breaking `hermes --tui` entirely (it
  spawns this module as a subprocess).  Guard each signal.signal() call with
  hasattr() and add SIGBREAK as Windows' SIGHUP equivalent.

- hermes_cli/kanban_db.py: os.waitpid(-1, os.WNOHANG) in dispatcher tick was
  unguarded.  os.WNOHANG doesn't exist on Windows.  Gate the whole reap loop
  behind `os.name != "nt"` — Windows has no zombies anyway.

- tools/code_execution_tool.py: AF_UNIX socket for execute_code RPC fails on
  most Windows builds.  Fall back to loopback TCP (AF_INET on 127.0.0.1:0
  ephemeral port) when _IS_WINDOWS.  HERMES_RPC_SOCKET env var now accepts
  either a filesystem path (POSIX) or `tcp://127.0.0.1:<port>` (Windows).
  Generated sandbox client parses both.

- cron/scheduler.py: `argv = ["/bin/bash", str(path)]` hardcoded.  Use
  shutil.which("bash") so Windows (Git Bash via MinGit) works, with a
  readable error when bash is genuinely absent.

- 6 bare npm/npx spawn sites: tools_config.py x2, doctor.py, whatsapp.py
  (npm install + node version probe), browser_tool.py x2.  On Windows npm
  is npm.cmd / npx is npx.cmd (batch shims); subprocess.Popen(["npm", ...])
  fails with WinError 193.  shutil.which(...) returns the absolute .cmd
  path which CreateProcessW accepts because the extension routes through
  cmd.exe /c.  POSIX behaviour unchanged (shutil.which still returns the
  same path subprocess would resolve itself).

## HIGH fixes (silent misbehaviour on Windows)

- tools/environments/local.py get_temp_dir: hardcoded /tmp returned on
  Windows meant `_cwd_file = "/tmp/hermes-cwd-*.txt"`, which bash wrote
  via MSYS2's virtual /tmp but native Python couldn't open.  Result: cwd
  tracking silently broken — `cd` in terminal tool did nothing.  Windows
  branch now returns `%HERMES_HOME%/cache/terminal` with forward slashes
  (works in both bash and Python, guaranteed no spaces).

- tools/environments/local.py _make_run_env PATH injection: `/usr/bin not
  in split(":")` heuristic mangles Windows PATH (";" separator).  Gate
  the injection behind `not _IS_WINDOWS`.

- hermes_cli/gateway.py launch_detached_profile_gateway_restart: outer
  Popen + watcher-script Popen both used start_new_session=True, which
  Windows silently ignores.  Watcher stayed attached to CLI's console,
  died when user closed terminal after `hermes update`, left gateway
  stale.  Now branches through windows_detach_popen_kwargs() helper
  (CREATE_NEW_PROCESS_GROUP | DETACHED_PROCESS | CREATE_NO_WINDOW on
  Windows, start_new_session=True on POSIX — identical to main).

## MEDIUM fixes

- gateway/run.py /restart and /update handlers: hardcoded bash/setsid
  chain crashes on Windows when user triggers /update in-gateway.  Now
  has sys.platform=="win32" branch using sys.executable + a tiny
  Python watcher with proper detach flags.  POSIX path is unchanged.

- cli.py _git_repo_root: Git on Windows sometimes returns /c/Users/...
  style paths that break subprocess.Popen(cwd=...) and Path().resolve().
  Added _normalize_git_bash_path() helper that translates /c/Users,
  /cygdrive/c, /mnt/c variants to native C:\Users form.  POSIX no-op.
  _git_repo_root() now routes every result through it.

- cli.py worktree .worktreeinclude: os.symlink on directories failed
  hard on Windows (requires admin or Developer Mode).  Falls back to
  shutil.copytree with a warning log.

## Tests

- 29 new tests in tests/tools/test_windows_native_support.py covering:
  subprocess_compat helpers, TUI entry signal guards, kanban waitpid
  guard, code_execution TCP fallback source-level invariants, cron bash
  resolution, npm/npx bare-spawn lint per-file, local env Windows temp
  dir, PATH injection gating, git bash path normalization, symlink
  fallback, gateway detached watcher flags.

- One existing test assertion adjusted in test_browser_homebrew_paths:
  it compared captured Popen argv to the BARE `"npx"` literal; after the
  shutil.which() change argv[0] is the absolute path.  New assertion
  checks the shape (two items, second is `agent-browser`) rather than
  the exact first-item string.  Behaviour unchanged; test was too strict.

All 56 tests pass on Linux (30 from previous commits + 26 new).
267 tests from the affected files/dirs (browser, code_exec, local_env,
process_registry, kanban_db, windows_compat) all pass — zero regressions.
tests/hermes_cli/ (3909 pass) and tests/gateway/ (5021 pass) unchanged;
all pre-existing test failures confirmed unrelated via `git stash` re-run.

## What's still deferred (LOW priority)

- Visible cmd-window flashes on short-lived console apps (~14 sites) —
  cosmetic, needs a follow-up pass once we have user reports.
- agent/file_safety.py POSIX-only security deny patterns — separate
  hardening task.
- tools/process_registry.py returning "/tmp" as fallback — theoretical;
  reachable only when all env-var candidates fail.

hermes_cli/gateway.py

@@ -445,6 +445,25 @@ def launch_detached_profile_gateway_restart(profile: str, old_pid: int) -> bool:
     if old_pid <= 0:
         return False
 
+    # The watcher is a tiny Python subprocess that polls the old PID and
+    # respawns the gateway once it's gone.  Both legs of the chain need
+    # platform-appropriate detach semantics:
+    #
+    # POSIX — ``start_new_session=True`` (os.setsid in the child) detaches
+    # from the parent's process group so Ctrl+C in the CLI doesn't
+    # propagate and the watcher/gateway survive the CLI exiting.
+    #
+    # Windows — ``start_new_session`` is silently accepted but does NOT
+    # detach.  The watcher stays attached to the CLI's console and dies
+    # when the user closes the terminal, leaving ``hermes update`` users
+    # with no running gateway until they re-invoke ``hermes gateway``
+    # manually.  The Win32 equivalent is the ``CREATE_NEW_PROCESS_GROUP |
+    # DETACHED_PROCESS | CREATE_NO_WINDOW`` creationflags bundle.
+    #
+    # ``windows_detach_popen_kwargs()`` returns the right kwargs for the
+    # host platform and is a no-op on POSIX (just ``start_new_session=True``).
+    from hermes_cli._subprocess_compat import windows_detach_popen_kwargs
+
     watcher = textwrap.dedent(
         """
         import os
@@ -466,21 +485,35 @@ def launch_detached_profile_gateway_restart(profile: str, old_pid: int) -> bool:
                 # Windows: gone PID raises OSError (WinError 87).
                 break
             time.sleep(0.2)
-        subprocess.Popen(
-            cmd,
-            stdout=subprocess.DEVNULL,
-            stderr=subprocess.DEVNULL,
-            start_new_session=True,
-        )
+
+        # Platform-appropriate detach for the respawned gateway.  On POSIX
+        # start_new_session=True maps to os.setsid; on Windows we need
+        # explicit creationflags because start_new_session is a no-op there.
+        _popen_kwargs = {
+            "stdout": subprocess.DEVNULL,
+            "stderr": subprocess.DEVNULL,
+        }
+        if sys.platform == "win32":
+            _CREATE_NEW_PROCESS_GROUP = 0x00000200
+            _DETACHED_PROCESS = 0x00000008
+            _CREATE_NO_WINDOW = 0x08000000
+            _popen_kwargs["creationflags"] = (
+                _CREATE_NEW_PROCESS_GROUP | _DETACHED_PROCESS | _CREATE_NO_WINDOW
+            )
+        else:
+            _popen_kwargs["start_new_session"] = True
+        subprocess.Popen(cmd, **_popen_kwargs)
         """
     ).strip()
 
     try:
+        # Same platform-aware detach for the watcher process itself — so
+        # closing the user's terminal doesn't kill the watcher.
         subprocess.Popen(
             [sys.executable, "-c", watcher, str(old_pid), *_gateway_run_args_for_profile(profile)],
             stdout=subprocess.DEVNULL,
             stderr=subprocess.DEVNULL,
-            start_new_session=True,
+            **windows_detach_popen_kwargs(),
         )
     except OSError:
         return False