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/convergence/quick-test.js

@@ -0,0 +1,56 @@
+const { createSolver } = require('../../src/solver.js');
+
+async function quickTest() {
+  console.log('Running quick convergence test...');
+
+  // Create a simple 3x3 diagonal matrix
+  const matrix = {
+    data: [
+      [2, 0, 0],
+      [0, 3, 0],
+      [0, 0, 4]
+    ],
+    rows: 3,
+    cols: 3,
+    format: 'dense'
+  };
+
+  const b = [2, 6, 12]; // Should give solution [1, 2, 3]
+
+  try {
+    const solver = await createSolver({
+      matrix: matrix,
+      method: 'jacobi',
+      tolerance: 1e-10,
+      maxIterations: 100,
+      verbose: true
+    });
+
+    const result = await solver.solve(b);
+
+    console.log('Results:');
+    console.log('  Solution:', result.values.map(x => x.toFixed(3)));
+    console.log('  Iterations:', result.iterations);
+    console.log('  Converged:', result.converged);
+    console.log('  Convergence Rate:', result.convergenceRate?.toFixed(1) + '%');
+    console.log('  Performance Grade:', result.performanceGrade);
+    console.log('  Residual:', result.residual?.toExponential(3));
+
+    return result;
+  } catch (error) {
+    console.error('Error:', error.message);
+    throw error;
+  }
+}
+
+if (require.main === module) {
+  quickTest().then(() => {
+    console.log('✅ Quick test passed!');
+    process.exit(0);
+  }).catch(error => {
+    console.error('❌ Quick test failed:', error.message);
+    process.exit(1);
+  });
+}
+
+module.exports = { quickTest };