feat: vendor midstream and sublinear-time-solver libraries

Add ruvnet/midstream (AIMDS real-time inference) and
ruvnet/sublinear-time-solver (sublinear optimization algorithms)
as vendored dependencies under vendor/.

Co-Authored-By: claude-flow <ruv@ruv.net>

vendor/sublinear-time-solver/tests/test-wasm-simple.cjs

@@ -0,0 +1,49 @@
+#!/usr/bin/env node
+/**
+ * Simple test of WASM solver
+ */
+
+const {
+    WasmSolver,
+    create_test_matrix,
+    create_test_vector,
+    version
+} = require('./wasm-solver/pkg/sublinear_wasm_solver.js');
+
+console.log('Testing WASM Solver...\n');
+
+try {
+    // Create solver
+    const solver = new WasmSolver();
+    console.log(`✅ Solver created, version: ${version()}`);
+
+    // Test with generated matrix
+    console.log('\nTesting with generated matrix:');
+    const matrixJson = create_test_matrix(3);
+    const vectorJson = create_test_vector(3);
+
+    console.log('Matrix JSON:', matrixJson);
+    console.log('Vector JSON:', vectorJson);
+
+    try {
+        const resultJson = solver.solve_csr(matrixJson, vectorJson);
+        const result = JSON.parse(resultJson);
+        console.log('✅ CSR solve succeeded!');
+        console.log('Result:', result);
+    } catch (e) {
+        console.error('❌ CSR solve failed:', e.message);
+    }
+
+    // Try Neumann method
+    try {
+        const resultJson = solver.solve_neumann(matrixJson, vectorJson);
+        const result = JSON.parse(resultJson);
+        console.log('✅ Neumann solve succeeded!');
+        console.log('Result:', result);
+    } catch (e) {
+        console.error('❌ Neumann solve failed:', e.message);
+    }
+
+} catch (error) {
+    console.error('Fatal error:', error);
+}