fix: normalize malformed Bash tool arguments from OpenAI-compatible providers (#385)

* fix: normalize malformed Bash tool arguments from OpenAI-compatible providers

* fix: keep invalid Bash tool args from becoming commands

* fix: preserve malformed Bash JSON literals

* test: stabilize rebased PR 385 checks

* test: isolate provider profile env assertions

* fix: extend tool argument normalization to all tools and harden edge cases

- Extend STRING_ARGUMENT_TOOL_FIELDS to normalize Read, Write, Edit,
  Glob, and Grep plain-string arguments (fixes "Invalid tool parameters"
  errors reported by VennDev)
- Normalize streaming Bash args regardless of finish_reason, not only
  when finish_reason is 'tool_calls'
- Broaden isLikelyStructuredObjectLiteral to catch malformed object-shaped
  strings like {command:"pwd"} and {'command':'pwd'} (fixes CR2 from
  Vasanthdev2004)
- Apply blank/object-literal guard to all tools, not just Bash
- Extract duplicated JSON repair suffix combinations into shared constant
- Add 32 isolated unit tests for toolArgumentNormalization

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* fix: skip streaming normalization on finish_reason length

Truncated tool calls (finish_reason: 'length') now preserve the raw
buffer instead of normalizing into executable commands, preventing
incomplete commands from becoming runnable.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* fix: comprehensive tool argument normalization hardening

- Remove all { raw: ... } returns that caused InputValidationError with
  z.strictObject schemas — return {} instead for clean Zod errors
- Extend normalizeAtStop buffering to all mapped tools (Read, Write,
  Edit, Glob, Grep) so streaming paths also get normalized
- Make repairPossiblyTruncatedObjectJson generic — repair any valid
  JSON object, not just ones with a command field
- Export hasToolFieldMapping for streaming normalizeAtStop decision
- Skip normalization on finish_reason: length to preserve raw truncated
  buffer
- Update all test expectations to match new behavior

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/utils/providerFlag.test.ts

@@ -1,4 +1,4 @@
-import { describe, expect, test, afterEach } from 'bun:test'
+import { afterEach, beforeEach, describe, expect, test } from 'bun:test'
 import {
   parseProviderFlag,
   applyProviderFlag,
@@ -8,18 +8,26 @@ import {
 
 const originalEnv = { ...process.env }
 
+const RESET_KEYS = [
+  'CLAUDE_CODE_USE_OPENAI',
+  'CLAUDE_CODE_USE_GEMINI',
+  'CLAUDE_CODE_USE_GITHUB',
+  'CLAUDE_CODE_USE_BEDROCK',
+  'CLAUDE_CODE_USE_VERTEX',
+  'OPENAI_BASE_URL',
+  'OPENAI_API_KEY',
+  'OPENAI_MODEL',
+  'GEMINI_MODEL',
+] as const
+
+beforeEach(() => {
+  for (const key of RESET_KEYS) {
+    delete process.env[key]
+  }
+})
+
 afterEach(() => {
-  for (const key of [
-    'CLAUDE_CODE_USE_OPENAI',
-    'CLAUDE_CODE_USE_GEMINI',
-    'CLAUDE_CODE_USE_GITHUB',
-    'CLAUDE_CODE_USE_BEDROCK',
-    'CLAUDE_CODE_USE_VERTEX',
-    'OPENAI_BASE_URL',
-    'OPENAI_API_KEY',
-    'OPENAI_MODEL',
-    'GEMINI_MODEL',
-  ]) {
+  for (const key of RESET_KEYS) {
     if (originalEnv[key] === undefined) delete process.env[key]
     else process.env[key] = originalEnv[key]
   }