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>

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

src/utils/schemaSanitizer.test.ts

@@ -0,0 +1,68 @@
+import { describe, expect, test } from 'bun:test'
+
+import { sanitizeSchemaForOpenAICompat } from './schemaSanitizer'
+
+describe('sanitizeSchemaForOpenAICompat', () => {
+  test('preserves Grep-like properties.pattern while keeping it required', () => {
+    const schema = {
+      type: 'object',
+      properties: {
+        pattern: {
+          type: 'string',
+          description: 'The regular expression pattern to search for in file contents',
+        },
+        path: { type: 'string' },
+        glob: { type: 'string' },
+      },
+      required: ['pattern'],
+    }
+
+    const sanitized = sanitizeSchemaForOpenAICompat(schema)
+    const properties = sanitized.properties as Record<string, unknown> | undefined
+
+    expect(Object.keys(properties ?? {})).toEqual(['pattern', 'path', 'glob'])
+    expect(properties?.pattern).toEqual({
+      type: 'string',
+      description: 'The regular expression pattern to search for in file contents',
+    })
+    expect(sanitized.required).toEqual(['pattern'])
+  })
+
+  test('preserves Glob-like properties.pattern while keeping it required', () => {
+    const schema = {
+      type: 'object',
+      properties: {
+        pattern: {
+          type: 'string',
+          description: 'The glob pattern to match files against',
+        },
+        path: { type: 'string' },
+      },
+      required: ['pattern'],
+    }
+
+    const sanitized = sanitizeSchemaForOpenAICompat(schema)
+    const properties = sanitized.properties as Record<string, unknown> | undefined
+
+    expect(Object.keys(properties ?? {})).toEqual(['pattern', 'path'])
+    expect(properties?.pattern).toEqual({
+      type: 'string',
+      description: 'The glob pattern to match files against',
+    })
+    expect(sanitized.required).toEqual(['pattern'])
+  })
+
+  test('strips JSON Schema validator pattern from string schemas', () => {
+    const schema = {
+      type: 'string',
+      pattern: '^[a-z]+$',
+      minLength: 1,
+    }
+
+    const sanitized = sanitizeSchemaForOpenAICompat(schema)
+
+    expect(sanitized).toEqual({
+      type: 'string',
+    })
+  })
+})