fix: Fixed context enhancement substring matching bug

[ravi-jindal]

Change Description

Fixed context enhancement substring matching bug where context words were incorrectly matched as substrings (e.g., 'lic' matching 'duplicate'). Now uses whole-word matching for accurate context detection
Describe your changes

Issue reference

Fixes #1061

Checklist

• I have reviewed the contribution guidelines
• I have signed the CLA (if required)
• My code includes unit tests
• All unit tests and lint checks pass locally
• My PR contains documentation updates / additions if required

[ravi-jindal]

@microsoft-github-policy-service agree

@microsoft-github-policy-service agree

[omri374]

Thanks! There was a reason behind this implementation. Context words might not always be separated by spaces. For example, card and credit_card. We can decide that context words must be exhaustive, but I wonder if you have suggestions on having both options available (either defined by config or working in parallel)