fix: stabilize governance contract checks

[T72]

Summary:

• make PhaseManager optional so non-phase commands do not fail when phase module is absent
• guard phase commands with explicit unavailable message when phase support is missing
• prevent enforcement standard mode from prompting in non-interactive/CI environments

Verification:

• python3 -m py_compile tm src/tm_production.py src/config_manager.py src/storage_paths.py
• bash scripts/validate-public-boundary.sh
• bash tests/test_storage_contract.sh
• bash tests/test_collaboration_event_store.sh
• bash tests/test_error_exit_codes.sh
• bash tests/test_public_manifest_pipeline.sh

[chatgpt-codex-connector]

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