Add NRF52 warm-build fast path

[zackees]

Summary

• add the shared warm-build fast path to the NRF52 orchestrator only
• persist and reuse NRF52 build fingerprints using the existing shared helper flow
• add local unit tests covering NRF52 fast-path watch and artifact wiring

Verification

• cargo check -p fbuild-build --lib
• cargo test -p fbuild-build nrf52:: --lib -- --nocapture

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 521f7e94-b3b8-4921-9ebb-b9366db4027e

📥 Commits

Reviewing files that changed from the base of the PR and between 2a9cd23 and a81c376.

📒 Files selected for processing (1)

• crates/fbuild-build/src/nrf52/orchestrator.rs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/issue-121-nrf52-fast-path

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