Write only mismatched ESP32 flash regions

[zackees]

Summary

• parse per-region esptool verify-flash output to identify which ESP32 flash regions actually differ
• selectively rewrite only the mismatched bootloader/partitions/firmware regions, with a full-flash fallback when the verify transcript is incomplete
• add deploy-side tests for selective write args and mismatch parsing

Testing

• cargo fmt --all --check
• cargo test -p fbuild-deploy esp32 -- --nocapture
• cargo test -p fbuild-daemon operations -- --nocapture

Closes #67.

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Reviewing files that changed from the base of the PR and between 1ddef46 and 9d8bb22.

📒 Files selected for processing (2)

• crates/fbuild-daemon/src/handlers/operations.rs
• crates/fbuild-deploy/src/esp32.rs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/issue-67-selective-write-flash

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[zackees]

Closing as superseded by #71, which merged the sector-selective ESP32 write-flash change into main while this PR was in flight.