Fix outdated detector API usage in scanning modules

[kavya-seth-vns]

Fixes #44

Summary

This PR updates the scanning utilities to use the current detector API and resolves the runtime failures caused by outdated detector interface usage.

Changes

• Replaced deprecated detector.detect() calls with detector.inspect().

• Updated DetectionResult field access to match the current API:

  • detected → matched

• Updated the affected modules:

  • scan.py
  • tools.py
  • streaming.py
  • rag.py

Validation

The issue was reproduced before the fix:

AttributeError: 'PromptInjectionDetector' object has no attribute 'detect'

After applying the changes:

• ✅ scan() executes successfully.
• ✅ scan_tool_output() executes successfully.
• ✅ StreamScanner.feed() executes successfully.
• ✅ scan_rag_input() executes successfully.

Testing

Executed the full test suite:

96 passed, 10 xfailed

Additionally, the following runtime checks were verified successfully:

• scan("hello")
• scan_tool_output("hello")
• StreamScanner().feed("hello")
• scan_rag_input("hello")

These changes align the scanning modules with the current Detector protocol and eliminate the AttributeError caused by calls to the removed detect() method.