fix(paths): use get_hermes_home() instead of hardcoded ~/.hermes

[erhnysr]

Summary

Replaces hardcoded ~/.hermes usage with get_hermes_home().

Why

Hardcoded paths bypass the HERMES_HOME environment variable, breaking custom setups and multi-instance usage.

Changes

• Replaced Path("~/.hermes") with get_hermes_home()

Scope

Minimal and safe change — no behavior modification beyond respecting HERMES_HOME.

[erhnysr]

The failing tests appear unrelated to this change.

This PR only replaces a hardcoded path with get_hermes_home(), and does not affect ACP or auth-related modules.

Happy to investigate further if needed, but this seems to be a pre-existing issue.

[binhnt92]

nice catch — #1233 did a sweep of these hardcoded paths back in March but looks like this one in file_tools.py slipped through

[teknium1]

Already fixed on main via commit e97c0cb (PR #3575 prep work). The hardcoded path in file_tools.py was replaced with get_hermes_home() in that commit. Thanks @erhnysr — your sibling PR #3232 was still needed and merged via #3840!