Initial ITECH IT6500 series DC PSU control tool

USB-TMC/SCPI driver and CLI for IT6500 series power supplies.
Commands: identify, measure, monitor, live, set, output, protection, config, send.
Auto-detects instrument via USB VID 0x2EC7 / PID 0x6522.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.gitignore

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+# Python-generated files
+__pycache__/
+*.py[oc]
+build/
+dist/
+wheels/
+*.egg-info
+
+# Virtual environments
+.venv