The Bio-Topological Interferometer (BTI v1) + Full KCR Specification

We present a single, modular interferometric platform (BTI v1) that unifies quantum‑optical interference, biological photoreception, and chiral metasurface apertures. Interchangeable cartridges (A0 metal, A1 bio‑slit, A2 chiral metasurface (MoS₂)) and cavity optics (HR/Gain/PCM/CPA) are paired with a cryptochrome spin‑chemistry stack and a fully specified Klein‑Cryptochrome Radiometer (KCR v4). Primary endpoints: ΔV/V under B/RF, OAM & non‑reciprocal Δφ in the chiral channel, and UPE↔fringe coupling in the bio channel. Tier‑1 KPIs (LoD, SNR, drift, thermal stability) are defined with realistic thresholds and formal recipes.