Prove pooled workspace request isolation

src/wasm/worker.cpp

@@ -1201,6 +1201,10 @@ private:
 	{
 		wasmtime::Config config;
 		wasmtime::PoolAllocationConfig pool;
+		// A workspace owns one core plus at most table_headroom side modules;
+		// side modules import its single memory/table. Keep allocator capacity at
+		// the existing handler-table boundary instead of imposing its 1000-slot default.
+		pool.total_core_instances(4097);
 		config.pooling_allocation_strategy(pool);
 		config.epoch_interruption(true);
 		// CRITICAL: the host (linux_fastcgi.cpp) installs its own SIGSEGV/SIGILL/