- Breaking: Assembler.assemble/2 returns a final Elixir AST compiled via
  Code.eval_quoted instead of {source_string, payload_path}
- Breaking: removed Zorb.Config.payload_path/1; dropped Sourceror dep
- Strip quote hygiene metadata so identifiers resolve in generated capsules
- Preserve nil literal return types when pruning version branches
- Bake story data in as byte-list literals (6x faster assemble)
- Upgrade watusi 0.6.3 and wasmex 0.15.1