Add Hermes Agent discovery support

[kriptoburak]

Summary

• Expands default GitHub discovery to include Hermes Agent and Hermes plugin repositories.
• Detects Hermes Agent plugins during repository inspection.
• Adds social capability and action-gate environment key recognition.

Checks

• License reviewed: MIT.
• Duplicate check: no open or closed Hermes Tweet, Xquik, or Hermes Agent PR found in this repo.
• Link check: Hermes Tweet repo, README, and .claude-plugin manifest return 200.
• Validation: uv run --python 3.12 pytest backend/tests/test_repository_inspection_service.py passed with project requirements minus unavailable optional mcp[cli].

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[kriptoburak]

Addressed the manifest-only detection finding in HEAD. The root .claude-plugin marker is now retained in source_files, and manifest-only plugin repos can still be classified as Hermes plugin entries.

Validation passed:

• Python 3.11 temp venv install with pip install -r backend/requirements.txt -r backend/requirements-dev.txt
• python -m pytest backend/tests/test_repository_inspection_service.py -q
• git diff --check

[kriptoburak]

Verified manifest-only Hermes detection on the current head. .claude-plugin is preserved in KEY_FILES and participates in classification, with a dedicated regression test. All 3 repository-inspection tests and backend Ruff hooks pass.