feat(router): fab-ready fix loop (prune, mutual-legality verdicts, class widths)#671
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Two fixes from the M6 reproducibility investigation: 1. wavefront_batch dispatched (n*total)/256 workgroups in one dimension; full-board batches need ~129k against the 65535/dim wgpu cap, so the first dispatch poisoned the encoder and every subsequent GPU batch silently fell back to CPU (observed: 'proposed 7/83' on the 40-net subset, 72 dead batches per full CM5 run — every published M6 run was effectively CPU-bound). Split over a 2D grid; the shader flattens via num_workgroups. After: 'proposed 83/83', zero validation errors. 2. The greedy pass's rip-up loop kept regressing rounds (CM5: 504 -> 489 placed over a 46-minute round, damage kept). Snapshot before each round and restore on regression, matching the negotiation loop's keep-best. Plus a board_export example (gerbers/excellon/kicad/bom/pick-place from a routed .pcb.json). Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
…lity verdict commits, class-width joint paths From the CM5 fab-ready campaign: - drc::prune_dangling_copper: remove trace/via islands touching no pad or pour of their net (rip-up debris; 4,185 dead traces on the CM5 run, NetIslands 172 -> 18, better than the fixture baseline's 30) - cm5_verdict: probe-then-commit per path (cluster paths were only node-disjoint on the coarse window grid — two same-cluster paths could overlap at exact geometry); route/commit SI-class nets at class width; exclude plane-fed nets from the verdict ratsnest - strip_nets + prune_copper + board_export examples: the DRC fix loop (strip offenders -> session-probed reroute -> prune -> re-DRC) that took the CM5 board to zero route-attributable violations in 5 rounds Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Tooling that took the routed CM5 to zero route-attributable DRC violations (details in commit message). Companion to the merged #669.
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