fix: restore Grep and Glob reliability on OpenAI paths (#461)

* fix: restore Grep and Glob reliability on OpenAI paths

Preserve Grep and Glob pattern fields during OpenAI/Codex schema sanitization, and fall back to system ripgrep when the packaged binary is missing. This keeps search tool schemas intact and improves Linux usability for npm/source installs.

Co-Authored-By: Claude Opus 4.6 <noreply@openclaude.dev>

* test: clean up ripgrep fallback test helpers

Remove the unused ripgrepCommand import and normalize mocked builtin ripgrep paths so the test behaves consistently across platforms.

Co-Authored-By: Claude Opus 4.6 <noreply@openclaude.dev>

* test: remove duplicate Codex URI schema case

Drop the duplicated WebFetch URI-format test in codexShim.test.ts so test names stay unique and failures remain easier to read.

Co-Authored-By: Claude Opus 4.6 <noreply@openclaude.dev>

* test: stabilize ripgrep fallback coverage

Avoid fs/module mocking in ripgrep fallback tests by extracting the config selection logic into a pure helper. This preserves the fallback coverage while removing the test interaction that caused the narrowed Bun hang repro.

Co-Authored-By: Claude Opus 4.6 <noreply@openclaude.dev>

* test: tighten ripgrep and schema coverage

Align the ripgrep fallback test with the actual auto-fallback branch, clean up strict typing in schema sanitizer tests, and tighten ripgrep error narrowing for type safety.

Co-Authored-By: Claude Opus 4.6 <noreply@openclaude.dev>

---------

Co-authored-by: Claude Opus 4.6 <noreply@openclaude.dev>

src/utils/ripgrep.test.ts

@@ -1,11 +1,52 @@
 import { expect, test } from 'bun:test'
+import path from 'path'
 
-import { wrapRipgrepUnavailableError } from './ripgrep.ts'
+import { resolveRipgrepConfig, wrapRipgrepUnavailableError } from './ripgrep.js'
+
+const MOCK_BUILTIN_PATH = path.normalize(
+  process.platform === 'win32'
+    ? `vendor/ripgrep/${process.arch}-win32/rg.exe`
+    : `vendor/ripgrep/${process.arch}-${process.platform}/rg`,
+)
+
+test('ripgrepCommand falls back to system rg when builtin binary is missing', () => {
+  const config = resolveRipgrepConfig({
+    userWantsSystemRipgrep: false,
+    bundledMode: false,
+    builtinCommand: MOCK_BUILTIN_PATH,
+    builtinExists: false,
+    systemExecutablePath: '/usr/bin/rg',
+    processExecPath: '/fake/bun',
+  })
+
+  expect(config).toMatchObject({
+    mode: 'system',
+    command: 'rg',
+    args: [],
+  })
+})
+
+test('ripgrepCommand keeps builtin mode when bundled binary exists', () => {
+  const config = resolveRipgrepConfig({
+    userWantsSystemRipgrep: false,
+    bundledMode: false,
+    builtinCommand: MOCK_BUILTIN_PATH,
+    builtinExists: true,
+    systemExecutablePath: '/usr/bin/rg',
+    processExecPath: '/fake/bun',
+  })
+
+  expect(config).toMatchObject({
+    mode: 'builtin',
+    command: MOCK_BUILTIN_PATH,
+    args: [],
+  })
+})
 
 test('wrapRipgrepUnavailableError explains missing packaged fallback', () => {
   const error = wrapRipgrepUnavailableError(
     { code: 'ENOENT', message: 'spawn rg ENOENT' },
-    { mode: 'builtin', command: 'C:\\fake\\vendor\\ripgrep\\rg.exe' },
+    { mode: 'builtin', command: 'C:\\fake\\vendor\\ripgrep\\rg.exe', args: [] },
     'win32',
   )
 
@@ -18,7 +59,7 @@ test('wrapRipgrepUnavailableError explains missing packaged fallback', () => {
 test('wrapRipgrepUnavailableError explains missing system ripgrep', () => {
   const error = wrapRipgrepUnavailableError(
     { code: 'ENOENT', message: 'spawn rg ENOENT' },
-    { mode: 'system', command: 'rg' },
+    { mode: 'system', command: 'rg', args: [] },
     'linux',
   )