tools: make targets + ota.sh for the build/OTA/verify loop

make build / cleanbuild / ota / verify / check wrap the recurring dev
loop, sourcing the ESP-IDF env per-recipe. `make ota` reconfigures first
(the embedded git hash stamps at configure time only), builds, pushes,
and verifies. tools/ota.sh encodes the OTA acceptance criterion — the
new image must show pending-verify on a fresh boot before flipping to
valid; "valid" with pending-verify never seen means the device silently
booted the old slot — and re-pushes once automatically on the known
first-push rollback quirk.

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