cah 41e2ef72ec feat: add SC-LDPC density evolution with threshold computation ...

Implement position-aware density evolution for SC-LDPC codes:
- sc_density_evolution(): flooding-schedule DE tracking per-position
  error rates, demonstrating the wave decoding effect
- compute_sc_threshold(): binary search for SC-LDPC threshold

Uses flooding schedule (not layered) to avoid belief divergence
from cross-position message interference in the coupled chain.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

2026-02-24 17:45:21 -07:00

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