cog

b8ce59b0 - refactor(playground): simplify event hub and compile validators once per connection

refactor(playground): simplify event hub and compile validators once per connection - Simplify Go event hub: drop slot/backpressure bookkeeping, make publish non-blocking best-effort (also fixes fan-out bug) - Compile input validators once per connection in a persistent shared worker keyed by schemaId, reused across runs - Extract shared format/json helpers; simplify prediction output state (drop rAF double-batching)