fix(windows): remove duplicate creationflags in local subprocess Popen call

[momowind]

Problem

On Windows, every terminal tool call fails with:

TypeError: subprocess.Popen() got multiple values for keyword argument 'creationflags'

Root Cause

In tools/environments/local.py, the _run_bash method passes creationflags to subprocess.Popen() twice on Windows:

1. Via _popen_kwargs dict (windows_hide_flags() → CREATE_NO_WINDOW)
2. Via explicit creationflags=subprocess.CREATE_NO_WINDOW parameter

Python raises TypeError when the same keyword argument appears twice (once directly, once via **dict expansion).

Fix

Remove the redundant explicit creationflags parameter. _popen_kwargs already handles it via the established windows_hide_flags() compat-layer helper.

Commit

2b454a0f1 — single-line deletion, 1 file changed, 1 deletion.

[alt-glitch]

Duplicate of #28898 — identical fix (remove duplicate creationflags kwarg in _run_bash() on Windows). See also #28920 (the bug report).

[teknium1]

Thanks for catching this Windows regression. This has since been fixed on main by the same one-line change, so I’m closing this as implemented on main.

Evidence from this automated hermes-sweeper review:

• tools/environments/local.py:593 on current origin/main builds _popen_kwargs = {"creationflags": windows_hide_flags()} if _IS_WINDOWS else {}.
• tools/environments/local.py:595-607 calls subprocess.Popen(...) with cwd=_popen_cwd, **_popen_kwargs and no separate explicit creationflags= keyword.
• Commit 05f02640e1f763afb7afdae4efe6b450016a908f removes exactly the stale creationflags=subprocess.CREATE_NO_WINDOW if _IS_WINDOWS else 0 line from LocalEnvironment._run_bash().
• That fix was merged via PR fix(windows): drop duplicate creationflags kwarg in LocalEnvironment run_bash #29059 as merge commit 62713c8b8926c5280a0dfbfcf42cf2c07ec8a047 and is contained in release tag v2026.5.28.

@alt-glitch’s duplicate note was accurate: this PR, #28898, and the bug report #28920 all point at the same duplicate-creationflags regression.