WIP: WASM port - switch to ncruces/go-sqlite3, add WASM stubs

- Switched from modernc.org/sqlite to ncruces/go-sqlite3 for WASM support
- Added WASM-specific stubs for daemon process management
- Created wasm/ directory with build.sh and Node.js runner
- WASM build succeeds (32MB bd.wasm)
- Node.js can load and execute the WASM module
- Next: Need to bridge Go file I/O to Node.js fs module

Related: bd-44d0, bd-8534, bd-c7eb

wasm/run.js

@@ -0,0 +1,28 @@
+#!/usr/bin/env node
+// Node.js wrapper for bd.wasm
+
+const fs = require('fs');
+const path = require('path');
+
+// Load wasm_exec.js from Go distribution
+require('./wasm_exec.js');
+
+// Load the WASM binary
+const wasmPath = path.join(__dirname, 'bd.wasm');
+const wasmBuffer = fs.readFileSync(wasmPath);
+
+// Create Go runtime instance
+const go = new Go();
+
+// Pass command-line arguments to Go
+// process.argv[0] is 'node', process.argv[1] is this script
+// So we want process.argv.slice(1) to simulate: bd <args>
+go.argv = ['bd'].concat(process.argv.slice(2));
+
+// Instantiate and run the WASM module
+WebAssembly.instantiate(wasmBuffer, go.importObject).then((result) => {
+    go.run(result.instance);
+}).catch((err) => {
+    console.error('Failed to run WASM:', err);
+    process.exit(1);
+});