fix(rust): index unit structs — bodiless is a definition, not a forward declaration (#1513) - #1514

Analyzed 8 changed files (5 symbols). Blast radius: 31 files, 235 symbols.

2 affected test files to run:

• __tests__/extraction.test.ts
• __tests__/kernel-rustlang-parity.test.ts

Report: http://localhost:5173/impact/8b6a06ca-6fcf-46e8-b131-aa692cc3821a