Ryan Malloy 609928ff6e Implement flash manager operations (write, read, erase, backup)
Replace stub implementations with real esptool subprocess calls.
Each operation runs esptool as an async subprocess with timeout,
matching the chip_control pattern. All four tools now work with
both physical ports and QEMU socket:// URIs.
2026-01-29 16:33:25 -07:00
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