weichenandCursor
7331323df4
Give pin materialize the CI git channel and a private database
Why: test-pg has no SSH known_hosts, and the shared agent_test database already holds another instance identity.
Evidence: SELF python3 -m unittest tests.test_ci_credentials.CheckoutTests.test_rdm_pin_fetch_is_three_shas_on_the_allowlist tests.integration.lifecycle.test_lifecycle_real (1 pass, 24 skip).
Impact: lifecycle children forward GIT_CONFIG_* only; serve stays env -i. Login and rdm.ping stay NOT_RUN.
Refs: .task/feature-svc-d3-real-scenarios.md
Co-authored-by: Cursor <cursoragent@cursor.com>