Add GitHub Actions CI: tests on Linux + Windows, MCP smoke test

2 jobs × 2 platforms:
- test: npm ci → build → 731 tests on ubuntu + windows × Node 18 + 20
- mcp-smoke: npm install from registry → import check → MCP stdio handshake

README badge now links to live CI status instead of static count.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: phillipclapham

.github/workflows/test.yml

@@ -0,0 +1,92 @@
+name: Tests
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+  workflow_dispatch:
+
+jobs:
+  test:
+    strategy:
+      matrix:
+        os: [ubuntu-latest, windows-latest]
+        node-version: ['18', '20']
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: ${{ matrix.node-version }}
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Build
+        run: npm run build
+
+      - name: Run tests
+        run: npm test
+
+  mcp-smoke:
+    strategy:
+      matrix:
+        os: [ubuntu-latest, windows-latest]
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+
+      - name: Install from npm (simulates real user)
+        run: npm install flowscript-core
+
+      - name: Verify import
+        run: node -e "const { Memory } = require('flowscript-core'); console.log('Import OK, Memory:', typeof Memory);"
+
+      - name: MCP server stdio handshake
+        shell: node {0}
+        run: |
+          const { spawn } = require('child_process');
+          const path = require('path');
+
+          const mcp = path.join('node_modules', 'flowscript-core', 'bin', 'flowscript-mcp');
+          const proc = spawn('node', [mcp, './test-memory.json'], {
+            stdio: ['pipe', 'pipe', 'pipe']
+          });
+
+          const msg = JSON.stringify({
+            jsonrpc: '2.0', id: 1, method: 'initialize',
+            params: {
+              protocolVersion: '2025-03-26',
+              capabilities: {},
+              clientInfo: { name: 'ci-test', version: '1.0' }
+            }
+          });
+
+          let output = '';
+          proc.stdout.on('data', (data) => { output += data.toString(); });
+
+          setTimeout(() => {
+            proc.stdin.write(msg + '\n');
+            setTimeout(() => {
+              const lines = output.trim().split('\n').filter(Boolean);
+              if (lines.length === 0) {
+                console.error('No response from MCP server');
+                process.exit(1);
+              }
+              const data = JSON.parse(lines[lines.length - 1]);
+              if (!data.result) {
+                console.error('Bad response:', JSON.stringify(data));
+                process.exit(1);
+              }
+              const info = data.result.serverInfo || {};
+              console.log(`MCP server OK: ${info.name} v${info.version}`);
+              console.log(`Platform: ${process.platform}`);
+              console.log(`Node: ${process.version}`);
+              proc.kill();
+              console.log('PASS: MCP stdio handshake works');
+            }, 2000);
+          }, 1000);

README.md

@@ -6,7 +6,7 @@
 
 <p align="center"><strong>Structured reasoning memory for AI agents. Five queries no vector store can answer: <code>why()</code>, <code>tensions()</code>, <code>blocked()</code>, <code>alternatives()</code>, <code>whatIf()</code>. Your agent builds the graph during normal work. You query it.</strong></p>
 
-[![Tests](https://img.shields.io/badge/tests-731%20passing-brightgreen)](https://github.com/phillipclapham/flowscript) [![npm](https://img.shields.io/npm/v/flowscript-core)](https://www.npmjs.com/package/flowscript-core) [![PyPI](https://img.shields.io/pypi/v/flowscript-agents)](https://pypi.org/project/flowscript-agents/) [![License: MIT](https://img.shields.io/badge/license-MIT-blue.svg)](LICENSE) [![Website](https://img.shields.io/badge/demo-flowscript.org-purple)](https://flowscript.org)
+[![Tests](https://github.com/phillipclapham/flowscript/actions/workflows/test.yml/badge.svg)](https://github.com/phillipclapham/flowscript/actions/workflows/test.yml) [![npm](https://img.shields.io/npm/v/flowscript-core)](https://www.npmjs.com/package/flowscript-core) [![PyPI](https://img.shields.io/pypi/v/flowscript-agents)](https://pypi.org/project/flowscript-agents/) [![License: MIT](https://img.shields.io/badge/license-MIT-blue.svg)](LICENSE) [![Website](https://img.shields.io/badge/demo-flowscript.org-purple)](https://flowscript.org)
 
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