Update repository-governance extension to v2.0.5

[bigsmartben]

Summary

• Update bundled repository-governance extension to v2.0.5.
• Update extensions/catalog.json metadata.
• Carry over the repository fact coverage and cross-platform packaging changes from the source release.

Source Release

• Source repo: https://github.com/bigsmartben/spec-kit-agent-governance
• Release: https://github.com/bigsmartben/spec-kit-agent-governance/releases/tag/v2.0.5
• Source commit: 34955f4a6446a31006e3d449623b982790d833eb
• Artifact: repository-governance-v2.0.5.zip

Test Plan

• python -m py_compile extensions/repository-governance/scripts/refresh_repository_governance.py
• python -m json.tool extensions/catalog.json
• python -m pytest -q tests/test_arch_templates.py tests/integrations/test_cli.py::TestGitExtensionOptIn::test_community_extensions_and_workflow_preset_auto_installed tests/integrations/test_cli.py::TestGitExtensionOptIn::test_no_git_keeps_community_defaults
• python -m pytest -q tests/test_presets.py -k workflow_preset_integration_release_payload_contract

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Add a download URL for the advertised update

When a project already has repository-governance v2.0.2 installed, this catalog bump makes specify extension update repository-governance detect 2.0.5 as an available update, but bundled catalog entries still have no download_url; the update path calls catalog.download_extension(...), which explicitly rejects bundled extensions without a download URL (src/specify_cli/extensions.py:2527-2533). Either include an installable 2.0.5 download URL in this catalog entry or avoid advertising a newer catalog version until bundled-extension updates can reinstall from the local package.

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