fix(terminal): prefer Git for Windows bash over Linux bash on Windows

On Windows machines with both Linux and Git for Windows installed,
_find_bash() called shutil.which('bash') before checking known
Git-for-Windows install paths.  shutil.which() may return a
non-MSYS bash which does not understand Windows-style paths.
This caused all terminal commands to fail with exit code 126
because the cwd prefix (a Windows path) was rejected.

Reorder the search: check Git for Windows install locations
(ProgramFiles/Git/bin/bash.exe etc.) before falling back to
PATH lookup.  This matches the intent of the surrounding code
(portable Git preferred, system Git preferred, then PATH as
last resort).

Related: #23846 (same file, same class of Windows path issues)

tools/environments/local.py

@@ -509,10 +509,10 @@ def _find_bash() -> str:
             if os.path.isfile(candidate):
                 return candidate
 
-    found = shutil.which("bash")
-    if found:
-        return found
-
+    # Check known Git for Windows install locations before PATH lookup.
+    # On machines with both WSL and Git for Windows, shutil.which("bash")
+    # may return WSL's bash (which doesn't understand Windows paths and
+    # will fail silently).  Explicit Git-for-Windows paths avoid that.
     for candidate in (
         os.path.join(os.environ.get("ProgramFiles", r"C:\Program Files"), "Git", "bin", "bash.exe"),
         os.path.join(os.environ.get("ProgramFiles(x86)", r"C:\Program Files (x86)"), "Git", "bin", "bash.exe"),
@@ -521,6 +521,10 @@ def _find_bash() -> str:
         if candidate and os.path.isfile(candidate):
             return candidate
 
+    found = shutil.which("bash")
+    if found:
+        return found
+
     raise RuntimeError(
         "Git Bash not found. Hermes Agent requires Git for Windows on Windows.\n"
         "Install it from: https://git-scm.com/download/win\n"