fix(repo): restore origin-main publish seals

[borjamoskv]

Summary

• restore the origin/main publish baseline so sovereign pre-push seals pass again
• replace banned datetime.now(...) usage in cortex/ with a shared UTC helper and remove blocking time.sleep violations
• fix connection-guard regressions, lower oversized modules below the LOC seal, and preserve engine/daemon behavior via extracted mixins
• add regression coverage for legacy Fact mapping access and keep the existing docs/seal tests green

Validation

• ruff check cortex/
• pyright cortex/ --outputjson (62/85 baseline)
• python3 -m cortex.database.connection_guard
• python3 -m cortex.guards.seals
• PYTHONPATH=. pytest -o addopts='' tests/test_engine_models.py tests/test_api_v5_additive_simple.py tests/test_docs_entrypoints.py tests/guards/test_sovereign_seals.py -q