Fix cargo fmt and clippy CI failures in http_preflight#287

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Copilot wants to merge 3 commits intomainfrom

copilot/fix-model-functionality-issue

Commits on Mar 1, 2026

Initial plan
Copilot
committed
Fix cargo fmt and clippy failures: format http_preflight files and add missing postflight_etl_path field in test_state

Copilot
and
jverdicc
committed
Remove test artifacts from tracking and add gitignore entries for crates/*/artifacts/ and proptest-regressions/

Copilot
and
jverdicc
committed