Remove Komodo backend in favor of native hosts

tests/helpers/agent-files.ts

@@ -0,0 +1,23 @@
+import * as fs from 'node:fs/promises';
+import { join } from 'node:path';
+import { vi } from 'vitest';
+
+/** Read-only agent transport backed by fixture files. Mutations still fail. */
+export async function mockAgentFiles() {
+    const backend = await import('../../src/lib/server/backends/native.js');
+    const { serverDir } = await import('../../src/lib/server/config.js');
+    return vi.spyOn(backend, 'nativeRequest').mockImplementation(async (instance, kind, payload = {}) => {
+        const path = join(serverDir(instance.server), String(payload.path ?? '.'));
+        let result: unknown;
+        if (kind === 'files.read') {
+            const content = await fs.readFile(path).catch((error: NodeJS.ErrnoException) => { if (error.code === 'ENOENT') return null; throw error; });
+            result = { contentBase64: content?.toString('base64') ?? null };
+        } else if (kind === 'files.stat') {
+            const stat = await fs.stat(path).catch((error: NodeJS.ErrnoException) => { if (error.code === 'ENOENT') return null; throw error; });
+            result = stat ? { exists: true, size: stat.size, mtime: stat.mtime.toISOString(), isDirectory: stat.isDirectory(), isFile: stat.isFile() } : null;
+        } else if (kind === 'files.list') {
+            result = { entries: (await fs.readdir(path, { withFileTypes: true })).map(entry => ({ name: entry.name, isDirectory: entry.isDirectory(), isFile: entry.isFile() })) };
+        } else throw new Error(`Unexpected agent command: ${kind}`);
+        return result as never;
+    });
+}