Zach Nelson 620835a6a1 chore: add firmware size history script (#1235) ...

## Summary

**What is the goal of this PR?**

- Adds `scripts/firmware_size_history.py`, a developer tool that builds
firmware at selected git commits and reports flash usage with deltas
between them.
- Supports two input modes: `--range START END` to walk every commit in
a range, or `--commits REF [REF ...]` to compare specific refs (which
can span branches).
- Defaults to a human-readable aligned table; pass `--csv` for
machine-readable output to stdout or `--csv FILE` to write to a file.

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### AI Usage

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Did you use AI tools to help write this code? _**YES, fully written by
AI**_

2026-03-01 10:28:32 -06:00

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