fix(terminal): suppress Windows desktop terminal console flashes

[LeonSGP43]

Summary

• opt windows_hide_flags() into CREATE_BREAKAWAY_FROM_JOB for Desktop/Electron terminal launches
• retry hidden local bash spawns once without breakaway when Windows denies that flag
• add regression tests for the hide-flag bundle and the LocalEnvironment retry path

Verification

• uv run python --version
• uv run --with pytest python -m pytest tests/tools/test_windows_native_support.py -k 'SubprocessCompatHelpers or LocalEnvironment'\n- uv run --extra dev python -m ruff check hermes_cli/_subprocess_compat.py tools/environments/local.py tests/tools/test_windows_native_support.py\n- git diff --check\n\nFixes Windows Desktop GUI: CREATE_NO_WINDOW insufficient — cmd windows flash on every terminal() call #53273

[tonydwb]

Code Review Summary

Verdict: Approved

Clean fix for Windows desktop terminal console flashes. Adds breakaway_from_job parameter to windows_hide_flags() for callers running under a Desktop/Electron job object where CREATE_NO_WINDOW alone still allows a visible console flash. Well-documented with clear rationale.

Looks Good

• Correct parameter addition with clear documentation
• Backward compatible (default breakaway_from_job=False)
• Good test coverage
• No security concerns

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Closing as superseded by the consolidated Windows console-flash work tracked in #54220.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