Feature/polya

[shuane]

This patch adds polya.py which implements George Polya's problem-solving framework as interactive prompt messages in SolveIt. The module provides:

1. Four main steps of Polya's method as classes (PolyaUnderstand, PolyaPlan, PolyaAct, PolyaReview)
2. Convenience instances of each step (understand, plan, act, review)
3. A QQ class for question prompts that can update the current message as a prompt or note
4. A Step base class that organizes related questions/prompts

The implementation allows users to:

• Access structured problem-solving questions through code completion
• Dynamically generate prompts during problem-solving sessions
• Follow Polya's systematic approach while maintaining flexibility

Usage Examples:

Basic usage with code completion:

# Message/Cell 1
import dialoghelper.polya as dhp

# Message/Cell 2 - best as a different cell so that dhp would be available after a "Run All"/Reset
dhp.understand.  # [tab completion shows: summary, info, similar, lateral, etc.]
dhp.understand.summary()  # Updates current message with summary prompt

The implementation provides a speedy and interactive way to guide problem-solving sessions while maintaining all the benefits of SolveIt's message system.

This PR was inspired by contextpack, which adds code completion for various projects' llms.txt or llms-ctx.txt URLs.

[shuane]

Will re-submit with some fixes...

[shuane]

Improved repr handling and reverted core to using fetchone (not selectone)