Fix Teensy builds with GCC 11 toolchain

[zackees]

Summary

• add a Teensy-specific ARM GCC package for PlatformIO toolchain-gccarmnoneeabi-teensy@1.110301.0 (GCC 11.3.1) with per-host checksums
• switch the Teensy orchestrator away from generic Arm GNU 15.2 to the Teensy-compatible package
• document the Teensy-specific toolchain path

Fixes #176.

Tests

• uv run --project C:\Users\niteris\dev\fbuild soldr cargo fmt --manifest-path E:\fbuild-issue-176\Cargo.toml --all --check
• uv run --project C:\Users\niteris\dev\fbuild soldr cargo test --manifest-path E:\fbuild-issue-176\Cargo.toml -p fbuild-packages teensy_arm --target-dir E:\fbuild-target-176 --jobs 2
• uv run --project C:\Users\niteris\dev\fbuild soldr cargo test --manifest-path E:\fbuild-issue-176\Cargo.toml -p fbuild-build --test teensy_build build_teensy41_fixture --target-dir E:\fbuild-target-176 --jobs 2 -- --ignored --nocapture

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 8cd17cd7-2cf3-4a2b-a829-0215ee0cfdf2

📥 Commits

Reviewing files that changed from the base of the PR and between 58671cd and 1f2a424.

📒 Files selected for processing (5)

• crates/fbuild-build/src/teensy/README.md
• crates/fbuild-build/src/teensy/orchestrator.rs
• crates/fbuild-packages/src/toolchain/README.md
• crates/fbuild-packages/src/toolchain/mod.rs
• crates/fbuild-packages/src/toolchain/teensy_arm.rs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/176-teensy-toolchain-codex

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