Layer-level recovery

Apply safety corrections at per-layer granularity.

Method	Mechanism
SafeMerge	Per-layer cosine gating
Safe LoRA	Project unsafe LoRA onto safe subspace
RESTA	Add safety vector with optional DARE sparsification
Safe Delta	OBS-style entry-wise weight edit
QReSafe	Quantization-aware safety patching
AAQ	Alignment-aware quantization
RepNoise recover	Post-hoc RepNoise injection