[seveibar]

Status: this RFC is an isolated supervisor experiment, not a production routing implementation. The concrete solver implementation and fresh 47/47 DDR routing proof are now tracked in bus-lanes-solver #102. That PR adds bounded default group routing but does not yet provide persistent checkpoints or establish whole-board completion.

A late DDR routing failure should return usable validated progress instead of discarding it after an unbounded search. This proposes an external supervisor with request/attempt deadlines, isolated candidates, independent validation, content-addressed checkpoints, and finite retries.

Includes an executable Bun prototype, a separate six-layer AM3352 fixture with RAM at (0, -29) mm, native validation reports, and an integration proposal for core's worker runtime and routing phases. Production routing defaults are unchanged.

Independent evidence

• No escape-placement planner from RFC: plan DDR escapes with movable decouplers #4948 is applied to this layout.
• The complete-DDR monolithic control timed out at 120 seconds in shared-layer routing.
• The staged supervisor validated and checkpointed byte 0 (11 connections), tried byte 1 twice, then returned incomplete after 11.724 seconds with the accepted copper preserved.
• A real-router fault-injection trial killed a deliberately 1-second attempt after 1.015 seconds, validated its retry, and retained the same copper when byte 1 failed.
• Resume revalidated the checkpoint and retried only byte 1 in 3.293 seconds. All 11 native checks passed on the retained byte lane.
• Neither the complete 47-connection DDR bus nor the whole board routed successfully. These results establish bounded recovery and retained progress, not faster whole-board completion.

Validation and limits

Two supervisor tests pass: non-cooperative worker termination/fallback/resume, and preservation after rejected output/corruption rejection. The targeted strict TypeScript check passes. Tests using synthetic output are separate from native board validation.

The fixture is a different placement of the earlier populated AM3352 circuit. Both proposal experiments share a pinned solver plus a disclosed common investigation patch; this is not a clean-upstream speed benchmark. The Bun prototype is outside the production build and still needs process-tree/browser lifecycle support, read-only checkpoint isolation, cancellation/concurrency handling, and whole-board stages.

This remains draft because the requested independent complete-board proof is outstanding.

See proposal and reproduction instructions and machine-readable evidence.

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Project	Deployment	Actions	Updated
tscircuit-core-benchmarks	Ready	Preview	Oct 27, 2026 6:36am UTC