sfs-identifiability-audit v0.2.0 (unrefereed candidate)

Certified repair release: rank-reduced LP bounds with 50-digit dual certificates and a declared grid ladder (v0.1.0 endpoints superseded as artefacts), genuinely independent Tavare-formula forward bridge with exact invertibility certificates and eight mutation controls, continuous piecewise-linear near-equivalent history (TV 4.70e-8), Bernstein global positivity certificate for the null pair, 23 deterministic tests, byte-reproducing replay. CC0. Zip sha256 ba8323d309168488c2ab06277e4206f9aeca7d1d7930c1d5ef3760eed2549508.