Implement AXIS parity UI and execution baseline

web/app/browser-compatibility.mjs

@@ -0,0 +1,27 @@
+export const BROWSER_COMPATIBILITY_SCHEMA = "browser-simulation-compatibility.v1";
+
+export async function runCompatibilityMatrix(client, { cycles = 8, chunk = 2 } = {}) {
+  if (!client || typeof client.hello !== "function" || typeof client.attach !== "function" || typeof client.stepMany !== "function") throw new Error("browser_client_invalid");
+  if (!Number.isSafeInteger(cycles) || cycles < 0 || cycles > 1000000 || !Number.isSafeInteger(chunk) || chunk < 1) throw new Error("browser_matrix_limit");
+  const capabilities = await client.hello();
+  const ready = await client.attach("compat-attach");
+  const stepped = await client.stepMany(cycles, { chunk, operationPrefix: "compat-step" });
+  const snapshot = await client.snapshot("compat-snapshot");
+  return {
+    schema: BROWSER_COMPATIBILITY_SCHEMA,
+    status: "verified",
+    context_id: client.contextId,
+    session_id: client.sessionId,
+    capabilities: capabilities.kind,
+    session_ready: ready.kind,
+    cycles,
+    chunks: stepped.chunks,
+    snapshot_kind: snapshot.kind,
+    logical_tick: snapshot.simulation_tick ?? stepped.last?.simulation_tick ?? 0,
+  };
+}
+
+export function performanceBudget({ cycles, chunks, maxCycles = 1000000, maxChunks = 1000000 } = {}) {
+  if (!Number.isSafeInteger(cycles) || cycles < 0 || cycles > maxCycles || !Number.isSafeInteger(chunks) || chunks < 0 || chunks > maxChunks) return { status: "blocked", code: "browser_performance_budget" };
+  return { status: "verified", cycles, chunks, logical_only: true };
+}