feedback(lang-roc-dev): expand Build and Dependencies section

## Feedback: lang-roc-dev

### Context
- **Task**: Creating `convert-roc-erlang` skill
- **Used for**: Understanding Roc's build system and dependency management

### What Worked Well
- Platform architecture is well explained
- Application structure is clear
- Module system is comprehensive

### Suggested Improvements
- [ ] Add dedicated ## Build and Dependencies section
- [ ] Document `roc` CLI commands (build, run, test, format, check)
- [ ] Explain platform URLs and package management
- [ ] Cover building for different targets (native, wasm)
- [ ] Add section on dependency resolution
- [ ] Document build configuration options
- [ ] Show how to work with local vs remote platforms
- [ ] Include compilation process overview
- [ ] Add troubleshooting for build errors

Build system is mentioned briefly but lacks comprehensive coverage that would help users understand the full development workflow.

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Feedback from: `/create-lang-conversion-skill roc erlang`