Task 550: Fix CI failures (human directive #28)

Status: DONE

Summary

Human directive: "CI がコケ続けていてデプロイがずっと失敗している"

Root causes identified and fixed:

1. cargo fmt — 9 Rust files had formatting issues (accumulated from Tasks 546-549)

- Fixed with cargo fmt --all

1. TypeScript typecheck — Two null-safety errors in article-content-validation.test.ts

- analysis.arrivalConsistency.progradeOnly possibly null

- analysis.trimThrust.primary possibly undefined

- Fixed by adding assert.ok() guards before accessing

1. poliastro pip install — astropy failed to compile from source in CI (Python 3.11)

- Root cause: Task 456 added poliastro to CI pip install, but Ubuntu CI lacked C compiler headers for astropy

- Fixed by using --only-binary ':all:' flag to force pre-built wheels

- Also upgraded pip first and used multi-line YAML block for compatibility

Impact

• CI went from all-red (since commit a813917, ~48 commits ago) to all-green
• Deploy to GitHub Pages resumed after being blocked for ~1 day
• All 5 CI jobs pass: Rust, TS, E2E, Cross-validate, WASM build