feat(homecore): add WASM-first developer metaharness (#1477)

Adds the accepted ADR-285 Homecore metaharness, WASM-first kernel, read-only MCP guidance, guarded local host adapters, reviewed memory, and provenance-only npm release gates.

harness/homecore/src/hosts/index.js

@@ -0,0 +1,17 @@
+// SPDX-License-Identifier: MIT
+
+import claudeCode from './claude-code.js';
+import codex from './codex.js';
+
+export { claudeCode, codex };
+
+export const HOSTS = Object.freeze({
+  'claude-code': claudeCode,
+  codex,
+});
+
+export function getHost(name) {
+  const host = HOSTS[name];
+  if (!host) throw new Error(`Unsupported host: ${name}`);
+  return host;
+}