feat(unstable): add package

Author: lowlighter

@mizu/unstable/README.md

@@ -0,0 +1,2 @@
+> [!CAUTION]
+> Features from this package may be subject to change in future versions. Use at your own risk.

@mizu/unstable/deno.jsonc

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+{
+  "name": "@mizu/unstable",
+  "version": "0.1.0",
+  "exports": {
+    "./noop": "./noop/mod.ts"
+  }
+}

@mizu/unstable/noop/README.md

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+# `*noop`
+
+| Version                                        | Phase          | Multiple |
+| ---------------------------------------------- | -------------- | -------- |
+| ![](https://jsr.io/badges/@mizu/unstable/noop) | 10 — `TESTING` | Yes      |
+
+This directive does nothing.
+
+```html
+<div *noop=""></div>
+```

@mizu/unstable/noop/mod.html

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+<mizu-directive id="noop" directory="unstable/noop">
+  <code #name><span class="hljs-keyword">*noop</span></code>
+  <p #description>
+    This directive does nothing.
+  </p>
+  <code #example *skip>
+    <div *noop></div>
+  </code>
+</mizu-directive>

@mizu/unstable/noop/mod.ts

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+// Imports
+import { type Directive, Phase } from "@mizu/mizu/core/engine"
+export type * from "@mizu/mizu/core/engine"
+
+/** `*_noop` directive. */
+export const _noop = {
+  name: "*noop",
+  phase: Phase.TESTING,
+  multiple: true,
+} as Directive
+
+/** Default exports. */
+export default _noop

@mizu/unstable/noop/mod_test.html

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+<load directives="@mizu/unstable/noop"></load>
+
+<test name="[*noop] does nothing">
+  <render>
+    <p *noop>foo</p>
+  </render>
+  <expect>
+    <p>foo</p>
+  </expect>
+</test>

@mizu/unstable/noop/mod_test.ts

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+await import("@mizu/mizu/core/testing").then(({ test }) => test(import.meta))

deno.jsonc

@@ -88,7 +88,8 @@
     "@mizu/skip",
     "@mizu/test",
     "@mizu/text",
-    "@mizu/toc"
+    "@mizu/toc",
+    "@mizu/unstable"
   ],
   "fmt": {
     "semiColons": false,