Two catalogue-driven TypeSafe Jev requests: per-effect usefulness nouls
plus a no-change gate, then pairwise ordering nouls tallied with Borda.
Pure logic lives in assembly.py with unit tests; the network call is in a
diagnostics script. Chains beyond eq-1 + distortion-1 are emitted with a
note since the optimizer does not support them yet. Adds the optional
assembly dependency group and ignores .env for API keys.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>