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Documents Milestone 3 across the four acquisition crates (vitals, hardware, wifiscan, calibration). Honest headline: this layer was already well-hardened, so the real work is small. - §A1 (perf, MEASURED): Vec::remove(0) O(n^2) sliding windows -> VecDeque. End-to-end win is NULL within noise at realistic window sizes (DSP dominates); the win is the algorithmic O(n^2)->O(n) shown in isolation. Claimed nothing more -- the committed bench proves the null. - §A2 (correctness): breathing partial-weights scale-mixing -> normalized by Sigma(effective weights). Pinned by two fail-on-old tests. - §A3 (stability): IIR resonator divergence. Corrected the research report's physically-inaccurate trigger (divergence needs |r|>=1, i.e. bw>=4, not "r negative"); clamp + finite-guard. Pinned by two fail-on-old tests. - §B1 hardening on an unreachable (already-gated) truncation path -- disclosed. - §B4 (constant-time HMAC compare) DEFERRED: not worth a new direct `subtle` dependency for an 8-byte LAN sync-beacon tag. - MEASURED negative-results section (the centerpiece): esp32_parser length gate, sync_packet infallible slices, the whole ieee80211bf validate-on-deserialize / no-panic-FSM / single-role / SBP-single-evaluate model, secure_tdm HMAC+replay, netsh_scanner fixed-argv + Option parse, geometry_embedding MAX_COORD_M -- each cited file:line, all NO-ACTION. - SOTA landscape: deep-CSI vitals (DATA-GATED), 802.11bf conformance (CLAIMED, non-public suite), per-room calibration (CLAIMED on numbers), native wlanapi FFI multi-BSSID (CLAIMED-unmeasured -- explicitly NOT claiming the 10x). Mostly NO-ACTION / ACCEPTED-FUTURE. - Deferred backlog (§8): nothing silently dropped. Validation: cargo test --workspace --no-default-features = 3054 passed / 0 failed; python verify.py = VERDICT PASS (hash unchanged, Rust-only changes). Co-Authored-By: claude-flow <ruv@ruv.net>