feat(build): wire build_unflags through all remaining platform compilers (#37)

[zackees]

Summary

Follow-up to PR #63 (ESP32 reference impl). Applies the same one-line builder-pattern wiring to every other platform, so PlatformIO `build_unflags` now strips framework/toolchain-contributed flags on:

• AVR
• Teensy
• Generic ARM (STM32, RP2040, Apollo3)
• nRF52, Renesas, Silabs
• CH32V
• SAM
• ESP8266

Per-compiler changes

Identical shape across 9 compiler files:

• Add `build_unflags: Vec` field, initialized empty in constructor
• Add `with_build_unflags(...)` builder method
• Override `Compiler::build_unflags()` to return `&self.build_unflags`

Per-orchestrator changes

Each orchestrator chains `.with_build_unflags(ctx.build_unflags.clone())` on every `XxxCompiler::new(...)` site (one per orchestrator; stm32 has two). Default-impl `compile_c` / `compile_cpp` in the `Compiler` trait already filter both platform and `extra_flags` through this set when non-empty (added in PR #63), so wiring each platform picks up framework-scope filtering automatically.

Test plan

• `uv run cargo clippy --workspace --all-targets -- -D warnings` clean
• `uv run cargo test -p fbuild-build --lib` — 447 passed
• CI green on Linux / macOS / Windows

Closes the remaining scope of #37.

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: e311e852-d9bb-44f8-8acc-5ce14c745fec

📥 Commits

Reviewing files that changed from the base of the PR and between 12ddd5a and 0f2a40a.

📒 Files selected for processing (20)

• crates/fbuild-build/src/apollo3/orchestrator.rs
• crates/fbuild-build/src/avr/avr_compiler.rs
• crates/fbuild-build/src/avr/orchestrator.rs
• crates/fbuild-build/src/ch32v/ch32v_compiler.rs
• crates/fbuild-build/src/ch32v/orchestrator.rs
• crates/fbuild-build/src/esp8266/esp8266_compiler.rs
• crates/fbuild-build/src/esp8266/orchestrator.rs
• crates/fbuild-build/src/generic_arm/arm_compiler.rs
• crates/fbuild-build/src/nrf52/nrf52_compiler.rs
• crates/fbuild-build/src/nrf52/orchestrator.rs
• crates/fbuild-build/src/renesas/orchestrator.rs
• crates/fbuild-build/src/renesas/renesas_compiler.rs
• crates/fbuild-build/src/rp2040/orchestrator.rs
• crates/fbuild-build/src/sam/orchestrator.rs
• crates/fbuild-build/src/sam/sam_compiler.rs
• crates/fbuild-build/src/silabs/orchestrator.rs
• crates/fbuild-build/src/silabs/silabs_compiler.rs
• crates/fbuild-build/src/stm32/orchestrator.rs
• crates/fbuild-build/src/teensy/orchestrator.rs
• crates/fbuild-build/src/teensy/teensy_compiler.rs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/issue-37-wire-remaining-platforms

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