Remove redundant Markdown preview provider

scripts/check.sh

@@ -213,8 +213,6 @@ if command -v node &>/dev/null; then
   report "platform-test frontend components mount" $?
   node "$ROOT/scripts/smoke-notes-plugin.js"
   report "notes frontend behavior" $?
-  node "$ROOT/scripts/smoke-markdown-preview-plugin.js"
-  report "markdown-preview frontend behavior" $?
   node "$ROOT/scripts/smoke-file-preview-plugin.js"
   report "file-preview frontend behavior" $?
   node "$ROOT/scripts/smoke-files-plugin.js"

scripts/smoke-file-preview-plugin.js

@@ -121,24 +121,6 @@ async function flush() {
   const document = makeDocument();
   const component = loadComponent(document);
 
-  const textContainer = new FakeNode('div');
-  const readPaths = [];
-  component.mount(textContainer, {
-    request: { path: 'Docs/app.log', extension: '.log', mode: 'view' },
-  }, {
-    files: {
-      metadata: async () => ({ type: 'file', size: 11, isText: true, modifiedAt: '2026-06-27T00:00:00Z' }),
-      readText: async (relativePath) => {
-        readPaths.push(relativePath);
-        return 'hello log';
-      },
-      openExternal: async () => undefined,
-    },
-  });
-  await flush();
-  if (readPaths[0] !== 'Docs/app.log') throw new Error('text preview did not read text file');
-  if (!textContainer.textContent.includes('hello log')) throw new Error('text preview did not render file text');
-
   const imageContainer = new FakeNode('div');
   const opened = [];
   component.mount(imageContainer, {
@@ -146,7 +128,7 @@ async function flush() {
   }, {
     files: {
       metadata: async () => ({ type: 'file', size: 2048, isText: false, modifiedAt: '2026-06-27T00:00:00Z' }),
-      readText: async () => { throw new Error('image preview should not read bytes through readText'); },
+      readText: async () => { throw new Error('file preview should not read text content'); },
       openExternal: async (relativePath) => { opened.push(relativePath); },
     },
   });

scripts/smoke-markdown-preview-plugin.js

@@ -1,138 +0,0 @@
-#!/usr/bin/env node
-const fs = require('fs');
-const path = require('path');
-const vm = require('vm');
-
-const root = path.resolve(__dirname, '..');
-const sourcePath = path.join(root, 'plugins', 'markdown-preview', 'frontend', 'src', 'index.js');
-const source = fs.readFileSync(sourcePath, 'utf8');
-
-class FakeNode {
-  constructor(tagName) {
-    this.tagName = String(tagName || '').toUpperCase();
-    this.children = [];
-    this.attributes = {};
-    this.listeners = {};
-    this.style = {};
-    this.className = '';
-    this.id = '';
-    this.parentNode = null;
-    this._innerHTML = '';
-    this._textContent = '';
-  }
-
-  appendChild(node) {
-    if (!(node instanceof FakeNode)) throw new TypeError('appendChild expects FakeNode');
-    this.children.push(node);
-    node.parentNode = this;
-    return node;
-  }
-
-  setAttribute(name, value) {
-    this.attributes[name] = String(value);
-    if (name === 'id') this.id = String(value);
-  }
-
-  getAttribute(name) {
-    return this.attributes[name];
-  }
-
-  addEventListener(type, handler) {
-    this.listeners[type] = this.listeners[type] || [];
-    this.listeners[type].push(handler);
-  }
-
-  set innerHTML(value) {
-    this._innerHTML = String(value || '');
-    this.children = [];
-  }
-
-  get innerHTML() {
-    return this._innerHTML + this.children.map((child) => child.innerHTML).join('');
-  }
-
-  set textContent(value) {
-    this._textContent = String(value || '');
-    this.children = [];
-  }
-
-  get textContent() {
-    if (this.tagName === '#TEXT') return this._textContent;
-    return this._textContent + this.children.map((child) => child.textContent).join('');
-  }
-}
-
-function makeDocument() {
-  return {
-    body: new FakeNode('body'),
-    head: new FakeNode('head'),
-    createElement(tagName) {
-      return new FakeNode(tagName);
-    },
-    createTextNode(text) {
-      const node = new FakeNode('#text');
-      node.textContent = text;
-      return node;
-    },
-    getElementById() {
-      return null;
-    },
-  };
-}
-
-function loadComponent(document) {
-  const registry = {};
-  const sandbox = {
-    console,
-    document,
-    window: {
-      VerstakPluginRegister(pluginId, bundle) {
-        registry[pluginId] = bundle.components || {};
-      },
-    },
-  };
-  sandbox.window.window = sandbox.window;
-  sandbox.window.document = document;
-  vm.runInNewContext(source, sandbox, { filename: sourcePath });
-  const component = registry['verstak.markdown-preview'] && registry['verstak.markdown-preview'].MarkdownPreview;
-  if (!component) throw new Error('MarkdownPreview was not registered');
-  return component;
-}
-
-async function flush() {
-  for (let i = 0; i < 8; i++) await Promise.resolve();
-}
-
-(async () => {
-  const document = makeDocument();
-  const component = loadComponent(document);
-  const container = new FakeNode('div');
-  const readPaths = [];
-  component.mount(container, {
-    request: { path: 'Docs/readme.md', mode: 'view' },
-  }, {
-    files: {
-      readText: async (relativePath) => {
-        readPaths.push(relativePath);
-        return '# Title\n\nParagraph with `code`.\n\n- one\n- two\n';
-      },
-    },
-  });
-  await flush();
-
-  if (container.getAttribute('data-plugin-id') !== 'verstak.markdown-preview') {
-    throw new Error('plugin id marker missing');
-  }
-  if (readPaths[0] !== 'Docs/readme.md') {
-    throw new Error(`expected readText Docs/readme.md, got ${readPaths[0] || '<none>'}`);
-  }
-  const html = container.innerHTML;
-  if (!html.includes('<h1>Title</h1>')) throw new Error('heading was not rendered');
-  if (!html.includes('<code>code</code>')) throw new Error('inline code was not rendered');
-  if (!html.includes('<li>one</li>') || !html.includes('<li>two</li>')) throw new Error('list items were not rendered');
-
-  console.log('markdown-preview smoke passed');
-})().catch((err) => {
-  console.error(err);
-  process.exit(1);
-});