Fix Teensy framework library resolution

[zackees]

Summary

Fixes #163.

• Switches the Teensy framework package from the core-only PaulStoffregen/cores archive to PlatformIO's full framework-arduinoteensy package.
• Adds Teensyduino framework library include discovery so headers like SPI.h and OctoWS2811.h are visible to Teensy builds.
• Selects and compiles only bundled framework libraries referenced by project sources, following transitive framework includes while skipping examples/extras/tests.
• Adds unit coverage for Teensy framework library resolution and an ignored integration build that includes SPI.h and OctoWS2811.h.

Verification

• cargo test -p fbuild-packages library::teensy_core
• cargo test -p fbuild-build teensy::orchestrator
• cargo test -p fbuild-build --test teensy_build build_teensy41_blink -- --ignored --nocapture
• cargo test -p fbuild-build --test teensy_build build_teensy41_spi_octo_headers -- --ignored --nocapture

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 058a81db-ce15-4d6c-8ff4-55b2fbfc57a8

📥 Commits

Reviewing files that changed from the base of the PR and between d7a215a and a9fc8a8.

📒 Files selected for processing (4)

• crates/fbuild-build/src/teensy/orchestrator.rs
• crates/fbuild-build/tests/teensy_build.rs
• crates/fbuild-packages/src/library/mod.rs
• crates/fbuild-packages/src/library/teensy_core.rs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix-teensy-framework-libs

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