[qmc] frustration-free: symmetric NQS for chiral graviton

[jiangweiqi001]

Summary

• add an antisymmetric, exact-SU(2)-projected Pfaffian NQS and finite-sphere ED/VMC acceptance framework for Challenge [challenge]: Symmetric neural-network ansatz for the chiral graviton in ν = 1/3 fractional quantum Hall state #15
• add auditable production orchestration, chiral-response operators, and Torch/DCU backend primitives
• include a Chinese evidence-backed report with deterministic SVGs, verified N=6 CPU smoke coverage, and the successful Torch Pfaffian DCU smoke
• clearly record that final N=6–8 scientific acceptance, multiplet certification, and chirality production results remain pending

Test plan

• deterministic report SVG regeneration and compact-manifest/raw-artifact consistency checks
• focused JAX, chiral-response, artifact/schema, and Torch primitive suites recorded in the report
• Torch Pfaffian target smoke passed on one BW DCU with Torch 2.4.1/HIP 6.1
• complete N=6–8 production VMC/exact evaluation and final scientific acceptance gates
• resolve the Torch projector checkpoint/JVP target-runtime compatibility item

Submission note

This is a standalone Challenge #15 submission and does not modify or merge into PR #152.

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