docs: add outpost engineering handbook
MA
2d ago+171+171+012345678901234567890123456789-1-1-0123456789
Summary
Related Issue: #
What
Why
How
Checklist
- This PR addresses a single concern (one bug fix, one feature, one refactor)
- The diff is reasonably sized and easy to review
- New functionality is covered by tests
- Linting and type checking pass (
uv run task lint && uv run task lint_types) - No unrelated changes or drive-by fixes are included