Add Renesas warm-build fast path

[zackees]

Summary

• add the shared warm-build fast-path wiring to the Renesas orchestrator only
• persist and reuse Renesas build fingerprints using project and resolved-lib watches
• add local unit coverage for the Renesas fast-path watch and artifact selection helpers

Verification

• cargo check -p fbuild-build --lib
• cargo test -p fbuild-build renesas::orchestrator::tests:: --lib

Refs #121

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 68929633-599e-4294-b777-80d2bf30ea2d

📥 Commits

Reviewing files that changed from the base of the PR and between 2a9cd23 and 9469d00.

📒 Files selected for processing (1)

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

✨ Finishing Touches

🧪 Generate unit tests (beta)

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

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