data: add SC-LDPC results and comprehensive comparison plots

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SC-LDPC threshold saturation results:
- SC original staircase: 2.28 photons/slot (vs 4.76 uncoupled)
- SC DE-optimized: 1.03 photons/slot (vs 3.21 uncoupled)
- Shannon limit: 0.47 photons/slot (remaining gap: 3.4 dB)

Add CLI to sc_ldpc.py (threshold, fer-compare, full subcommands).
Add threshold progression, SC threshold bars, and SC FER plots.

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

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cah

2026-02-24 18:35:50 -07:00

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