fix(mcp): deterministic test coverage for enableMcpApps, restore .pqt extension

Split the conditional enableMcpApps test into two explicit tests that
override the config value, ensuring both branches are exercised regardless
of CI environment. Restore .pqt to TABULAR_EXTS alongside .pq to avoid
silently dropping files for users with pandas-generated Parquet files.

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

Author: jqnatividad

.claude/skills/src/browse-directory.ts

@@ -10,7 +10,7 @@ import { readdir, stat as fsStat } from "node:fs/promises";
 
 /** Tabular file extensions recognised by the directory scanner. */
 export const TABULAR_EXTS = new Set([
-  ".csv", ".tsv", ".tab", ".ssv", ".parquet", ".pq",
+  ".csv", ".tsv", ".tab", ".ssv", ".parquet", ".pq", ".pqt",
   ".jsonl", ".ndjson", ".json", ".xlsx", ".xls",
   ".xlsm", ".xlsb", ".ods",
 ]);

.claude/skills/tests/mcp-app.test.ts

@@ -15,18 +15,34 @@ import { join } from "node:path";
 import { createTestDir, cleanupTestDir } from "./test-helpers.js";
 
 describe("MCP App tool definitions", () => {
-  test("qsv_set_working_dir _meta.ui.resourceUri depends on enableMcpApps config", async () => {
+  test("qsv_set_working_dir includes _meta.ui when enableMcpApps is true", async () => {
     const { createSetWorkingDirTool } = await import("../src/mcp-tools.js");
     const { config } = await import("../src/config.js");
-    const tool = createSetWorkingDirTool();
-
-    if (config.enableMcpApps) {
+    const mutableConfig = config as { -readonly [K in keyof typeof config]: (typeof config)[K] };
+    const original = mutableConfig.enableMcpApps;
+    try {
+      mutableConfig.enableMcpApps = true;
+      const tool = createSetWorkingDirTool();
       assert.ok(tool._meta, "tool should have _meta when apps enabled");
       const ui = tool._meta!.ui as Record<string, unknown>;
       assert.ok(ui, "tool._meta should have ui");
       assert.strictEqual(ui.resourceUri, "ui://qsv/directory-picker");
-    } else {
+    } finally {
+      mutableConfig.enableMcpApps = original;
+    }
+  });
+
+  test("qsv_set_working_dir omits _meta when enableMcpApps is false", async () => {
+    const { createSetWorkingDirTool } = await import("../src/mcp-tools.js");
+    const { config } = await import("../src/config.js");
+    const mutableConfig = config as { -readonly [K in keyof typeof config]: (typeof config)[K] };
+    const original = mutableConfig.enableMcpApps;
+    try {
+      mutableConfig.enableMcpApps = false;
+      const tool = createSetWorkingDirTool();
       assert.strictEqual(tool._meta, undefined, "tool should not have _meta when apps disabled");
+    } finally {
+      mutableConfig.enableMcpApps = original;
     }
   });
 
@@ -244,7 +260,7 @@ describe("scanDirectory (extracted from qsv_browse_directory handler)", () => {
 
   test("TABULAR_EXTS covers expected extensions", async () => {
     const { TABULAR_EXTS } = await import("../src/browse-directory.js");
-    for (const ext of [".csv", ".tsv", ".tab", ".ssv", ".parquet", ".pq", ".jsonl", ".ndjson", ".json", ".xlsx", ".xls", ".xlsm", ".xlsb", ".ods"]) {
+    for (const ext of [".csv", ".tsv", ".tab", ".ssv", ".parquet", ".pq", ".pqt", ".jsonl", ".ndjson", ".json", ".xlsx", ".xls", ".xlsm", ".xlsb", ".ods"]) {
       assert.ok(TABULAR_EXTS.has(ext), `should include ${ext}`);
     }
     assert.ok(!TABULAR_EXTS.has(".txt"), "should not include .txt");