fix(samd): wire platform_packages override (#677)

[zackees]

Finishes the half-migration from #870. samd_core.rs already grew with_override there, but the call site in install_samd_core was still calling SamdCores::new unconditionally — #870's report flagged this as the lone skipped platform pending framework-name verification.

Resolution: fbuild ships Adafruit's ArduinoCore-samd, so the matching PlatformIO package name is framework-arduino-samd-adafruit (PIO also has framework-arduino-samd for Arduino MKR/Zero and framework-arduino-samd-seeed for Seeeduino, neither of which fbuild currently builds). I resolve the override at the SAM/SAMD branching site alongside the existing __sam_ovr and thread it through install_samd_core's new override_:Option<PackageOverride> parameter.

Test plan

• soldr cargo check -p fbuild-build clean
• soldr cargo clippy -p fbuild-build --all-targets -- -D warnings clean
• soldr cargo fmt -p fbuild-build no-op

Closes #677

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Reviewing files that changed from the base of the PR and between b6246ff and 57c398b.

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• crates/fbuild-build/src/sam/orchestrator.rs

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• Commit unit tests in branch fix/677-samd-platform-packages-override

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