Add minimal Pipeline9 trace preloading

[seveibar]

Summary

• add Pipeline9 as an independent BaseSolver pipeline with an explicit copy of the Pipeline7 stages
• keep pre-routed traces out of obstacle-rectangle preprocessing
• quantize trace crossings onto existing graph ports and serialize them as ordinary hypergraph assignments
• pass pre-routed traces to simplification as immutable routed context
• expose Pipeline9 in the debugger, sample runner, and benchmark aliases

Deliberately excluded

• no inheritance from Pipeline7 or runtime mutation of its pipelineDef
• no ijump or B01 rerouter
• no Pipeline9-specific DRC guard or repair solver
• no capacity-region or port creation for preloaded traces
• no downstream Pipeline7 stage replacement

Verification

• bun test --timeout 9999999 tests/features/preloaded-trace-graph-solver.test.ts tests/features/preloaded-fixed-segment-occupancy.test.ts tests/features/pipeline9-minimal-preloaded-trace-graph.test.ts tests/features/trace-simplification-immutable-routes.test.ts
• bunx tsc --noEmit
• bun run build
• ./benchmark.sh --pipeline 9 --dataset srj23 --scenario-limit 1 --concurrency 1 --effort 1 --sample-timeout 60s (100% solved, 100% relaxed DRC for the smoke sample)

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Project	Deployment	Actions	Updated (UTC)
capacity-node-autorouter	Ready	Preview	Jul 30, 2026 8:57pm

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