[andres-javier-lopez]

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[Copilot]

Pull Request Overview

This PR adds functionality to allow custom entrypoints for builders in the graph construction system. This enables builders to dynamically set entry points that create a LIFO (Last In, First Out) chain leading to the default agent node.

• Introduces a configurable entrypoint property in BuilderContext
• Modifies the graph construction to use the custom entrypoint instead of always starting at the agent node
• Moves entrypoint setting from SingleAgent to the base builder class

Reviewed Changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
tests/unit/test_builder.py	Adds test case demonstrating custom entrypoint functionality with expected edge configuration
examples/entrypoint_graph.ipynb	Complete Jupyter notebook example showing custom entrypoint implementation and graph visualization
assistant_core/builder/context.py	Implements entrypoint property with LIFO queue behavior for chaining custom nodes
assistant_core/builder/base.py	Moves entrypoint setting to base builder class for consistent behavior
assistant_core/builder/agent.py	Removes hardcoded entrypoint setting from SingleAgent
CHANGELOG.md	Documents the new feature addition

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