fix(windows): hide console windows from subprocess spawns

[MichaelQee]

What does this PR do?

Fixes three Windows-specific console window flash issues:

1. _SlashWorker post-turn restart — subprocess.Popen in tui_gateway/server.py was missing creationflags=subprocess.CREATE_NO_WINDOW. Every agent turn restarted the worker, flashing a Python window each time.

2. ps.exe fallback in process checks — gateway/status.py and hermes_cli/gateway.py had code comments saying "Windows has no ps", but Git Bash installs ps.exe at C:\Git\usr\bin\ps.exe. The fallback executed ps in a visible console window. Fixed by skipping ps on Windows and using psutil directly.

3. Weixin aiodns SelectorEventLoop error — aiohttp on Windows requires WindowsSelectorEventLoopPolicy, which wasn't set before asyncio.run() in run_gateway(). This caused weixin/微信 connections to fail with "aiodns needs a SelectorEventLoop". Fixed by setting the policy at startup.

Related Issue

Fixes #

Type of Change

• 🐛 Bug fix (non-breaking change that fixes an issue)

Changes Made

• tui_gateway/server.py: Add creationflags=CREATE_NO_WINDOW to _SlashWorker.__init__ Popen call
• gateway/status.py: Skip ps.exe fallback in _read_process_cmdline on Windows, use psutil
• hermes_cli/gateway.py: (1) Add sys.platform == "win32" guard to _get_parent_pid ps fallback. (2) Set WindowsSelectorEventLoopPolicy before asyncio.run() in run_gateway

How to Test

1. Test 1 (SlashWorker flash): On Windows with Hermes TUI, send a message that triggers tool calls. After the agent responds, observe no Python window flash.
2. Test 2 (ps.exe flash): On Windows with Git Bash installed, run hermes gateway run and observe no blank ps.exe window at 30-second intervals.
3. Test 3 (Weixin): On Windows, configure weixin platform and start gateway. Verify connect succeeds instead of failing with "aiodns needs SelectorEventLoop".

Checklist

Code

• I've read the Contributing Guide
• My commit messages follow Conventional Commits
• I searched for existing PRs to make sure this isn't a duplicate
• My PR contains only changes related to this fix/feature (no unrelated commits)
• I've run pytest tests/ -q and all tests pass
• I've added tests for my changes (required for bug fixes, strongly encouraged for features)
• I've tested on my platform: Windows 11

Documentation & Housekeeping

• I've updated relevant documentation (README, docs/, docstrings) — or N/A
• I've updated cli-config.yaml.example — or N/A
• I've updated CONTRIBUTING.md or AGENTS.md — or N/A
• I've considered cross-platform impact (Windows, macOS) per the compatibility guide
• I've updated tool descriptions/schemas — or N/A

[tonydwb]

Code Review Summary

Verdict: LGTM

Hides console windows from subprocess spawns on Windows. Three targeted fixes across different subsystems.

Changes

• gateway/status.py: Uses psutil instead of ps command on Windows (avoids Git Bash console flash)
• hermes_cli/gateway.py: Skips ps fallback on Windows, adds WindowsSelectorEventLoopPolicy for aiohttp
• tui_gateway/server.py: Adds CREATE_NO_WINDOW flag to subprocess.Popen

Looks Good

• psutil is already a dependency, clean fallback
• WindowsSelectorEventLoopPolicy fix is well-documented (aiohttp/aiodns compatibility)
• CREATE_NO_WINDOW flag prevents console flashes from TUI gateway
• Platform-specific guards are correctly conditioned on sys.platform

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Reviewed by Hermes Agent

[teknium1]

Closing as superseded by the consolidated Windows console-flash work tracked in #54220.

The relevant pieces from this PR/cluster have now landed through the targeted follow-up PRs #54236, #53892, and #54417, or are recorded in the umbrella tracker for any remaining native-Windows verification. Keeping this separate PR open would duplicate the tracker and the merged follow-up work.

Thanks for digging into this — the reports and PRs in this cluster helped identify the remaining spawn legs.