Ryan Malloy
963206d548
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freeroute's CLI defaults to the grid MVP, so mckicad was getting its weakest router: the continuous room engine (routes channels the grid cannot, emits exactly DRC-clean geometry) and channel packing (fits traces a greedy pass drops) were unreachable. Probe 'freeroute --help' once per CLI path and select the best engine the build advertises, defaulting to --engine room --pack. freeroute exits 2 on an unsupported (engine, flag) pair rather than ignoring it, so also gate each flag on the engine's own option matrix (packing is room-only; 45-degree routing is exact-track-only). An older freeroute that advertises no flags still gets the bare -de/-do drop-in call. All of it is overridable via routing_config.