Adds §2.0 — the primary MERIDIAN path is now a three-stage pipeline:
1. pre-train a CIG-MAE-style dual-stream (amplitude+phase) masked autoencoder
on heterogeneous CSI (data breadth > pose-net capacity — arXiv:2511.18792);
2. fine-tune the existing §2.1–§2.6 heads (17-kpt/DensePose, AETHER, domain-
adversarial, geometry-conditioned) on top of the pre-trained encoder;
3. adapt per-room with source-free unsupervised domain adaptation behind
coherence_gate.rs::Recalibrate (separate ADR).
§2.1+ is retained but re-framed as the fine-tune-stage head, not a from-scratch
design. Adds the supporting references (2511.18792, 2512.04723, 2605.01369,
2506.12052, ACM TOSN 10.1145/3715130) and points at the 2026-Q2 SOTA survey.
Co-Authored-By: claude-flow <ruv@ruv.net>
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