Instrument ESP32 framework library build tail

[zackees]

Summary

• Emit immediate FBUILD_PERF_LOG phase-start/phase-finish events with wall-clock and last_phase labels.
• Add ESP32 tail checkpoints around framework built-in library compilation, source scanning, compile phases, link/convert/size, boot artifacts, and fingerprint save.
• Log archive start in library compilation so a stall after the last compile [lib] line can be distinguished from archive or orchestrator handoff.

Closes #117.

Tests

• uv run cargo fmt --all
• uv run soldr cargo check -p fbuild-build -p fbuild-packages
• git diff --check

Caveat

• uv run soldr cargo test -p fbuild-build perf_log --lib was attempted, but the host ran out of disk space while compiling dependencies (rustc-LLVM ERROR: IO failure on output stream: no space on device) before reaching the crate tests.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 95fe0925-cae6-4c1f-80bd-d4cb5ee1a65b

📥 Commits

Reviewing files that changed from the base of the PR and between 58671cd and ea6b2d4.

📒 Files selected for processing (3)

• crates/fbuild-build/src/esp32/orchestrator.rs
• crates/fbuild-build/src/perf_log.rs
• crates/fbuild-packages/src/library/library_compiler.rs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/117-esp32-tail-instrumentation

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