teensy: prefer local FastLED over framework FastLED

[zackees]

Summary

• fix the Teensy framework-library auto-selection bug that was compiling bundled libraries/FastLED even when the project already provided a local lib/FastLED
• make the resolver prefer project-local headers in src/, include/, and lib/ over bundled framework headers with the same basename, while still allowing transitive framework dependencies like SPI.h
• add unit and ignored teensy30 integration regression coverage for the local lib/FastLED shadowing path

Root Cause

This was not an SPI.h header conflict.

The failure came from the Teensy framework-library selector building a basename map of bundled framework headers and treating the sketch's #include <FastLED.h> as a request to compile the bundled framework FastLED library, even when the project already had its own lib/FastLED/FastLED.h.

That caused two independent build paths to compile FastLED into the same link:

• project-local library compilation from lib/FastLED/...
• bundled framework-library compilation from framework-arduinoteensy/.../libraries/FastLED/...

SPI.h only shows up as a legitimate transitive dependency after local FastLED is selected.

Testing

• cargo test -p fbuild-build resolve_teensy_framework_libraries -- --nocapture
• cargo test -p fbuild-build --test teensy_build build_teensy30_fixture_prefers_local_fastled -- --ignored --nocapture

Fixes #199.
Closes #195.

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ℹ️ Review info

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Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

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Run ID: 9f14cad5-72d9-4c6f-95ba-a08a8b476cf4

📥 Commits

Reviewing files that changed from the base of the PR and between 3cc09b8 and e1fe476.

📒 Files selected for processing (2)

• crates/fbuild-build/src/teensy/orchestrator.rs
• crates/fbuild-build/tests/teensy_build.rs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/issue-195-teensy30-fastled-shadow

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