What does this PR do?

Skill config path resolution could expand ~ against the wrong HOME in profile/container contexts. This PR routes skill config path expansion through the Hermes path helper so tilde expansion follows the intended Hermes environment.

Related Issue

Related to skill config path expansion under overridden Hermes homes.

Type of Change

• 🐛 Bug fix (non-breaking change that fixes an issue)
• ✨ New feature (non-breaking change that adds functionality)
• 🔒 Security fix
• 📝 Documentation update
• ✅ Tests (adding or improving test coverage)
• ♻️ Refactor (no behavior change)
• 🎯 New skill (bundled or hub)

Changes Made

• Use the shared Hermes path expansion helper in agent/skill_utils.py.
• Adjust hermes_constants.py path expansion support.
• Add regression tests for HOME-sensitive skill config expansion.

How to Test

1. Check out this PR branch.
2. Run: .venv/bin/python -m pytest -o 'addopts=' tests/agent/test_expand_hermes_path.py -q
3. Expected result: 5 passed

Checklist

Code

• I've read the Contributing Guide
• My commit messages follow Conventional Commits (fix(scope):, feat(scope):, etc.)
• 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 — focused pytest passed; full suite was not run in this salvage pass
• I've added tests for my changes (required for bug fixes, strongly encouraged for features)
• I've tested on my platform: Linux container / Python 3.11

Documentation & Housekeeping

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

Screenshots / Logs

Focused verification:

`.venv/bin/python -m pytest -o 'addopts=' tests/agent/test_expand_hermes_path.py -q` — 5 passed