fix: add Python version upper bound to prevent 3.14 compatibility war…

[SandeepChauhan00]

##Fixes #42

Summary

Adds an upper bound to the Python version requirement to prevent installation on Python 3.14+, where langchain-core currently emits a Pydantic V1 deprecation warning.

Problem

When users run the project with Python 3.14.0, the following warning appears on every startup:
UserWarning: Core Pydantic V1 functionality isn't compatible with Python 3.14 or greater.
from pydantic.v1.fields import FieldInfo as FieldInfoV1

The application still works, but the warning is noisy and indicates future incompatibility.

Solution

Updated pyproject.toml:

requires-python = ">=3.12,<3.14"
This prevents accidental installation on Python 3.14+ until dependencies (especially langchain-core) fully support Pydantic V2 / Python 3.14.

Benefits
Eliminates the deprecation warning for all users
Future-proofs the project
Clear signal of supported Python versions

[SandeepChauhan00]

Hi team! 👋

Following up on this compatibility fix for Python 3.14. This addresses
Issue #42 by adding an upper bound to prevent future breaking changes.

What this does:

• ✅ Prevents installation on Python 3.14+ (which will deprecate Pydantic v1)
• ✅ Gives users clear error message instead of cryptic warnings
• ✅ Buys time for proper Pydantic v2 migration

This is a low-risk defensive measure that prevents future user confusion.
The fix is minimal and ready for review.

Would appreciate your thoughts on this approach. Happy to discuss
alternatives if you have concerns!

Thanks!