AGENTS.md: new 'Python development' section (venv paths, install/lint/typecheck/test commands, conventions, full PS->Python sub-command mapping, list of PS scripts that stay PowerShell, link to phase closeouts). README.md: expand 'Python orchestrator' with examples for all 10 sub-commands (wait-ready, vm new/remove/cleanup, build run, artifacts collect, monitor disk/runner, report job, job), local validation gates with 80% coverage gate, link to test_agents_errors.py. docs/ARCHITECTURE.md: new 'Python orchestrator (Phase A)' section with package layout tree, VmBackend Protocol contract, load_backend(config) factory, Phase C ESXi extension recipe, transport selection note, and CI validation gates.
Simone
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