Add neural-moonshine SNN zkperf witness

Run 2: 6158 eRDFa shards + indexes, collection manifest

Experiment 2: 1.55M cycles, 1.87M instructions, IPC 1.2038

Expanded shard viewer: 12 groups, collapsible tree, rich CBOR rendering

Interactive viewer: experiment summary + shard browser with CBOR decoder

Add experiments.parquet: structured multi-experiment format

Symbol coverage proof: 26 runtime symbols, 18 hot instructions, 672 binary symbols

Proven perf data: 1.58M cycles, 1.83M instructions, 5790 cache-misses, 9589 branch-misses

initial commit