Add RX laptop handoff workflow

docs/handoff/RX_NODE_STATE.md

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+# RX node state
+
+ROLE =
+RX node for SDR_Rover_Video
+
+LAPTOP PROJECT PATH =
+C:\Users\Professional\Documents\Codex\SDR_Rover_Video
+
+BRANCH =
+video-development
+
+EXPECTED CURRENT HEAD =
+1ff8ccf27ec81b3b06aeb8af12793d1516a67a16
+
+This HEAD is the baseline before the handoff commit. Record the new HEAD after pulling the branch.
+
+HARDWARE =
+Auron HackRF Plus
+
+hackrf_info identifies device as =
+HackRF One
+
+PYTHON =
+3.13.0 in .venv
+
+KNOWN SOFTWARE STATUS =
+offline RF-001: 100/100 exact packets
+pip check: PASS
+ruff targeted paths: PASS
+pyright: PASS
+
+These are previously reported results. Verify the current laptop state in NEXT_RX_TASK.md.
+
+ROLE POLICY =
+The laptop is primarily the RX node. The main PC owns development and pushes video-development. The RX laptop pulls the branch and executes the current task.
+
+DO NOT WITHOUT EXPLICIT TASK AUTHORIZATION:
+- RF TX
+- firmware update
+- CPLD update
+- hackrf_spiflash
+- Zadig
+- USB driver changes
+- commit to video-development
+- push to video-development
+
+Large raw IQ and video files must not be added to Git unless explicitly required.