docs: expand AGENTS.md with entry point, config, and workflow notes

[vimalk78]

Correct the MyPy "strict mode" claim, document the runner.py →
uvicorn → FastAPI startup chain and workers=1 invariant, explain the
AppConfig singleton and test reset behavior, point to README for MCP,
and add a generator + critic workflow for non-trivial changes.

Description

Type of change

• Refactor
• New feature
• Bug fix
• CVE fix
• Optimization
• Documentation Update
• Configuration Update
• Bump-up dependent library
• Bump-up library or tool used for development (does not change the final image)
• CI configuration change
• Konflux configuration change

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