Update repository-governance extension to v3.0.2

[bigsmartben]

Summary

• Update bundled repository-governance extension to v3.0.2.
• Update extensions/catalog.json metadata.

Test Plan

• python3 -m py_compile extensions/repository-governance/scripts/generate_repository_governance.py
• python3 -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
• python3 -m pytest -q tests/test_presets.py -k workflow_preset_integration_release_payload_contract
• python3 -m json.tool extensions/catalog.json >/dev/null

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Add the required Assisted-by trailer

/workspace/spec-kit/AGENTS.md requires every agent-authored commit to carry an Assisted-by: trailer identifying the agent and whether it was autonomous or supervised. This commit is authored by Codex but its message has only the summary/test plan and no trailer, so it violates the repository's required disclosure policy; please update the commit message before merge.

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