feat: add formatted output for Claude Code execution reports (#18)

* feat: add formatted output for Claude Code execution reports

- Write turns formatter
- Modify GitHub Action to call formatter instead of dumping raw JSON
- Add comprehensive unit tests (30 tests) covering all functionality
- Add integration test with sample data for output consistency
- Support syntax highlighting for multiple content types (JSON, Python, bash, etc.)
- Include turn grouping logic and token usage tracking
- Provide CLI interface for standalone formatter usage

🤖 Generated with [Claude Code](https://claude.ai/code)
Note: seriously I have never written any line of ts code in my life, so
please make sure this is fine as I don't give any guarantees

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

* Add fallback

---------

Co-authored-by: Claude <noreply@anthropic.com>

test/fixtures/sample-turns-expected-output.md

@@ -0,0 +1,95 @@
+## Claude Code Report
+
+## 🚀 System Initialization
+
+**Available Tools:** 8 tools loaded
+
+---
+
+I'll help you with this task. Let me start by examining the file to understand what needs to be changed.
+
+### 🔧 `Read`
+
+**Parameters:**
+```json
+{
+  "file_path": "/path/to/sample/file.py"
+}
+```
+
+**Result:**
+```python
+def example_function():
+    print("Debug message")  # This should be removed
+    return "Hello World"
+
+if __name__ == "__main__":
+    result = example_function()
+    print(result)
+```
+
+*Token usage: 100 input, 75 output*
+
+---
+
+I can see the debug print statement that needs to be removed. Let me fix this by editing the file.
+
+### 🔧 `Edit`
+
+**Parameters:**
+```json
+{
+  "file_path": "/path/to/sample/file.py",
+  "old_string": "def example_function():\n    print(\"Debug message\")  # This should be removed\n    return \"Hello World\"",
+  "new_string": "def example_function():\n    return \"Hello World\""
+}
+```
+
+**→** File successfully edited. The debug print statement has been removed.
+
+*Token usage: 200 input, 50 output*
+
+---
+
+Perfect! I've successfully removed the debug print statement from the function. Let me now create a pull request comment to document this change.
+
+### 🔧 `mcp__github__add_pull_request_review_comment`
+
+**Parameters:**
+```json
+{
+  "owner": "example-org",
+  "repo": "example-repo",
+  "pull_number": 123,
+  "body": "Removed debug print statement as requested.",
+  "commit_id": "abc123def456",
+  "path": "sample/file.py",
+  "line": 2
+}
+```
+
+**→** Successfully posted review comment to PR #123
+
+*Token usage: 150 input, 80 output*
+
+---
+
+Great! I've successfully completed the requested task:
+
+1. ✅ Located the debug print statement in the file
+2. ✅ Removed the print statement while preserving the function logic
+3. ✅ Added a review comment documenting the change
+
+The debug print statement has been removed as requested by the reviewers.
+
+*Token usage: 180 input, 60 output*
+
+---
+
+## ✅ Final Result
+
+Successfully removed debug print statement from file and added review comment to document the change.
+
+**Cost:** $0.0347 | **Duration:** 18.8s
+
+