v2.0.0 — three-lane capability-creep triage gate
Adds two detection lanes beyond symbol-diffing: a compile-time surface lane (new/changed build.rs, proc-macro transition, native links =) and a dependency-tree diff. Plus a sticky PR comment, opt-in fail-on merge gating, a .rust-symbol-audit.toml allow/ignore config, and smarter max-crates. Local suite: 31 passed, 0 failed. See CHANGELOG. Superseded by v3.0.0.