feat(component): add @choojs/component — nanocomponent + on-load as ES classes

Ported from nanocomponent 6.6.0 and on-load 3.4.1 (MIT) with attribution:
render/update/morph lifecycle, proxy nodes with isSameNode identity, and
the MutationObserver-driven load/unload hooks. This class is the intended
island/hydration boundary for later phases. @choojs/core exposes ./timing
as a subpath for the instrumentation calls.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_014NgfSjHE11oFpoSnLVKLXd

packages/component/package.json

@@ -0,0 +1,29 @@
+{
+  "name": "@choojs/component",
+  "version": "8.0.0-dev",
+  "description": "Native DOM components with lifecycle hooks — the choo island boundary",
+  "type": "module",
+  "exports": {
+    ".": "./index.js",
+    "./onload": "./onload.js"
+  },
+  "files": [
+    "index.js",
+    "onload.js"
+  ],
+  "engines": {
+    "node": ">=24"
+  },
+  "dependencies": {
+    "@choojs/core": "*",
+    "@choojs/html": "*"
+  },
+  "repository": "choojs/choo",
+  "keywords": [
+    "component",
+    "dom",
+    "lifecycle",
+    "choo"
+  ],
+  "license": "MIT"
+}