feat: add AIUI node capabilities — file reading, log tailing, bitcoin/lnd deep data

Add readFileAsText() to filebrowser client, read-file and tail-logs action
handlers to context broker, bitcoin.getinfo and lnd.getinfo RPC enrichment
for context categories, and update AIUI protocol types.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

neode-ui/src/api/filebrowser-client.ts

@@ -121,6 +121,40 @@ class FileBrowserClient {
     return { totalSize, folderCount, fileCount }
   }
 
+  private static TEXT_EXTENSIONS = new Set([
+    'txt', 'md', 'json', 'csv', 'log', 'conf', 'yaml', 'yml', 'toml', 'xml',
+    'html', 'css', 'js', 'ts', 'py', 'sh', 'bash', 'env', 'ini', 'cfg',
+    'sql', 'rs', 'go', 'java', 'c', 'h', 'cpp', 'hpp', 'rb', 'php',
+    'dockerfile', 'makefile', 'gitignore', 'editorconfig',
+  ])
+
+  isTextFile(path: string): boolean {
+    const ext = path.includes('.') ? path.split('.').pop()!.toLowerCase() : ''
+    const name = path.split('/').pop()?.toLowerCase() || ''
+    return FileBrowserClient.TEXT_EXTENSIONS.has(ext) || FileBrowserClient.TEXT_EXTENSIONS.has(name)
+  }
+
+  async readFileAsText(path: string, maxBytes = 102400): Promise<{ content: string; truncated: boolean; size: number }> {
+    if (!this.isAuthenticated) {
+      const ok = await this.login()
+      if (!ok) throw new Error('FileBrowser authentication failed')
+    }
+    if (!this.isTextFile(path)) {
+      throw new Error(`Cannot read binary file: ${path}`)
+    }
+    const safePath = path.startsWith('/') ? path : `/${path}`
+    const res = await fetch(`${this.baseUrl}/api/raw${safePath}`, {
+      headers: this.headers(),
+    })
+    if (!res.ok) throw new Error(`Failed to read file: ${res.status}`)
+    const blob = await res.blob()
+    const size = blob.size
+    const truncated = size > maxBytes
+    const slice = truncated ? blob.slice(0, maxBytes) : blob
+    const content = await slice.text()
+    return { content, truncated, size }
+  }
+
   async rename(oldPath: string, newName: string): Promise<void> {
     const safePath = oldPath.startsWith('/') ? oldPath : `/${oldPath}`
     const dir = safePath.substring(0, safePath.lastIndexOf('/') + 1)