feat(web): add cache busting with version-based asset loading

- Inject git hash via Vite plugin for cache-busting WASM/JS assets
- Enable Emscripten assertions for better runtime error messages
- Log Emscripten runtime init for debugging filesystem readiness
- Expand dockerignore to exclude web build artifacts

web/vite.config.ts

@@ -1,11 +1,58 @@
 import tailwindcss from "@tailwindcss/vite";
 import react from "@vitejs/plugin-react";
 import vike from "vike/plugin";
-import { defineConfig } from "vite";
+import { defineConfig, Plugin } from "vite";
 import path from "path";
+import { execSync } from "child_process";
+
+/**
+ * Vite plugin that injects the Pacman version hash at build time.
+ * Uses git commit hash in production/dev, falls back to timestamp if git unavailable.
+ */
+function pacmanVersionPlugin(): Plugin {
+  let version: string;
+
+  function getVersion(mode: string): string {
+    // Development mode uses fixed "dev" string
+    if (mode === "development") {
+      return "dev";
+    }
+
+    // Try to get git commit hash
+    try {
+      const hash = execSync("git rev-parse --short HEAD", {
+        encoding: "utf8",
+        stdio: ["pipe", "pipe", "pipe"],
+      }).trim();
+      
+      if (hash) {
+        return hash;
+      }
+    } catch {
+      // Git not available or command failed
+    }
+
+    // Fallback to timestamp
+    return Date.now().toString(36);
+  }
+
+  return {
+    name: "pacman-version",
+    config(_, { mode }) {
+      version = getVersion(mode);
+      console.log(`[pacman-version] Using version: ${version}`);
+
+      return {
+        define: {
+          "import.meta.env.VITE_PACMAN_VERSION": JSON.stringify(version),
+        },
+      };
+    },
+  };
+}
 
 export default defineConfig({
-  plugins: [vike(), react(), tailwindcss()],
+  plugins: [pacmanVersionPlugin(), vike(), react(), tailwindcss()],
   resolve: {
     alias: {
       "@": path.resolve(__dirname, "."),