feat(rp2040): wire up RP2040/RP2350 build orchestrator

[zackees]

Summary

• Replace the stub RP2040 orchestrator (which returned "Rp2040Cores package not wired up") with a real build implementation
• Follow the STM32 pattern: ARM GCC toolchain + arduino-pico cores + generic ArmCompiler/ArmLinker
• Simplify mcu_config.rs to reuse ArmMcuConfig instead of the redundant Rp2040McuConfig type

Test plan

• All 6 RP2040 unit tests pass
• Full workspace clippy clean (-D warnings)
• Full workspace test suite passes
• CI: Build Raspberry Pi Pico workflow passes
• CI: Build Raspberry Pi Pico 2 workflow passes

Summary by CodeRabbit

• New Features

  • RP2040 microcontroller builds are now fully functional with complete compilation and linking support, including toolchain integration and MCU configuration.

• Refactor

  • Consolidated MCU configuration handling to use a shared ARM architecture model for improved consistency across builds.

[coderabbitai]

Caution

Review failed

Pull request was closed or merged during review

📝 Walkthrough

Walkthrough

The changes consolidate RP2040 MCU configuration onto a shared ArmMcuConfig type, removing a custom Rp2040McuConfig struct. The orchestrator is updated from a placeholder to a functional build implementation that installs dependencies, scans sources, gathers configuration, constructs include paths, and executes a sequential ARM compilation and linking pipeline.

Changes

Cohort / File(s)	Summary
Config Type Migration crates/fbuild-build/src/rp2040/mcu_config.rs	Removed custom Rp2040McuConfig struct and McuConfig trait implementation. Updated get_rp2040_config_for_mcu() to return ArmMcuConfig instead, parsing embedded JSON directly into the shared generic ARM type. Updated tests to validate architecture and compiler flags.
Build Orchestrator Implementation crates/fbuild-build/src/rp2040/orchestrator.rs	Replaced placeholder error-returning build() method with full implementation. Creates build context, installs ARM GCC toolchain and RP2040 cores, scans multi-directory sources, gathers MCU config and defines, constructs include paths from project/framework/toolchain sources, instantiates ARM compiler and linker, and executes sequential build pipeline.

Sequence Diagram(s)

sequenceDiagram
participant Orchestrator as RP2040<br/>Orchestrator
participant Toolchain as ARM GCC<br/>Toolchain
participant Cores as RP2040<br/>Cores Package
participant Config as MCU Config<br/>(ArmMcuConfig)
participant Compiler as ArmCompiler
participant Linker as ArmLinker
participant Pipeline as Build<br/>Pipeline
Orchestrator->>Orchestrator: Create BuildContext
Orchestrator->>Toolchain: Ensure installed
Toolchain-->>Orchestrator: Tool paths & versions
Orchestrator->>Cores: Ensure installed
Cores-->>Orchestrator: Core sources available
Orchestrator->>Orchestrator: Scan source files<br/>(sketch + framework)
Orchestrator->>Config: Fetch MCU config<br/>(now ArmMcuConfig)
Config-->>Orchestrator: Arch, compiler flags,<br/>linker script
Orchestrator->>Orchestrator: Build include path list<br/>(project + framework +<br/>toolchain + SDK)
Orchestrator->>Compiler: Instantiate with config
Orchestrator->>Linker: Instantiate with<br/>linker script & memory
Orchestrator->>Pipeline: Execute compilation<br/>& linking
Pipeline->>Compiler: Compile sources
Pipeline->>Linker: Link objects
Pipeline-->>Orchestrator: Build artifacts

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Estimated code review effort

🎯 4 (Complex) | ⏱️ ~45 minutes

Poem

🐰 Whiskers twitch with glee,
Config types now unified as one,
RP2040 orchestrator springs to life—
A complete build dance, no placeholder strife,
ARM compilers sing as sources compile!

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 75.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The pull request title 'feat(rp2040): wire up RP2040/RP2350 build orchestrator' directly and clearly describes the main change—implementing the RP2040/RP2350 build orchestrator that was previously a stub.

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/rp2040-orchestrator

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