fix: stabilize generated ino cpp output

[zackees]

Summary

• normalize generated .ino.cpp #line paths to project-relative slash paths when possible
• normalize .ino input line endings to LF before writing generated output
• document generated .ino.cpp stability rules

Closes #649

Tests

• soldr cargo fmt
• soldr cargo test -p fbuild-build source_scanner
• soldr cargo clippy -p fbuild-build --all-targets -- -D warnings
• soldr cargo test -p fbuild-build

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 5b9d6a64-0a6f-456e-8929-787ef9476fff

📥 Commits

Reviewing files that changed from the base of the PR and between dfb2907 and c1b4f2b.

📒 Files selected for processing (2)

• crates/fbuild-build/src/source_scanner.rs
• docs/reference/platformio-compatibility.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/649-stable-ino-generation

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