Prepare Windows runtime skills for community release

[CorsenAI]

Summary

• explain why path routing and Python runtime selection are separate complementary skills
• cross-link each skill to the other with direct install sources
• improve README discoverability for Hermes Agent, Windows, Git Bash/MSYS, WSL, and Python runtime queries
• document the validated local-backend scope and fail closed for Docker or remote filesystem namespaces
• add publication-contract tests for companion links, backend guards, and audit wording

Validation

• PowerShell 7 production suite: PASS
• Windows PowerShell 5.1 production suite: PASS
• live WSL gate on Ubuntu-24.04 with Python 3.12: PASS
• Git Bash/MSYS contracts: PASS
• Gitleaks full-history and working-tree scan: PASS
• actionlint: PASS
• gh skill publish --dry-run: PASS

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