Wave 16: install ergonomics + gradient evidence + SDPO end-to-end example

Wave 15: 4-angle multi-model self-critique caught 2 math BLOCKERs in primary loss kernels; fixed against upstream byte-for-byte + GSM8K example + ergonomics

Tidy .gitignore (de-dup *.jsonl, restore section blank lines)

Spike 007: include synthetic_session.jsonl fixture in repo

Spike v0.0 laydown + spike 001 VALIDATED

Initial commit: Composer 2.5 Replication Framework — research synthesis