Add Neo4j GraphRAG samples

[ltwlf]

Summary

• add a runnable Neo4j GraphRAG Python sample under python/samples/02-agents/context_providers/neo4j_graphrag
• add a runnable Neo4j GraphRAG .NET sample as AgentWithRAG_Step05_Neo4jGraphRAG
• wire the new .NET sample into the RAG sample index and solution
• use the published Neo4j.AgentFramework.GraphRAG and agent-framework-neo4j packages rather than repo-local integrations

Why

A previous Neo4j context-provider PR existed, but it was documentation-only

Validation

• python3 -m py_compile python/samples/02-agents/context_providers/neo4j_graphrag/main.py
• uv run /Users/ltwlf/Sources/ltwlf/agent-framework/python/samples/02-agents/context_providers/neo4j_graphrag/main.py
• dotnet build dotnet/samples/02-agents/AgentWithRAG/AgentWithRAG_Step05_Neo4jGraphRAG/AgentWithRAG_Step05_Neo4jGraphRAG.csproj -c Debug
• dotnet run --framework net10.0 --project dotnet/samples/02-agents/AgentWithRAG/AgentWithRAG_Step05_Neo4jGraphRAG/AgentWithRAG_Step05_Neo4jGraphRAG.csproj
• fresh-cache restore for the .NET sample via NUGET_PACKAGES=$(mktemp -d) dotnet restore ... --configfile dotnet/nuget.config

Notes

• Python sample follows the sample guidelines with PEP 723 inline dependencies so uv run works directly.
• The live validation used a real Neo4j database plus Azure AI Foundry / Azure OpenAI resources.

[Copilot]

Pull request overview

Adds runnable Neo4j GraphRAG samples to both the Python and .NET sample sets, using the published Neo4j provider packages and wiring the new .NET sample into the existing AgentWithRAG sample lineup/solution.

Changes:

• Add a Python Neo4j GraphRAG context-provider sample (neo4j_graphrag) runnable via uv run (PEP 723 inline deps).
• Add a .NET Neo4j GraphRAG RAG sample project (AgentWithRAG_Step05_Neo4jGraphRAG) and include it in the AgentWithRAG index + solution.
• Pin Neo4j sample package versions via central package management and exclude the Python sample from pyright sample configs.

Reviewed changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
python/samples/02-agents/context_providers/neo4j_graphrag/README.md	Documents the new Python Neo4j GraphRAG sample, prerequisites, and env vars.
python/samples/02-agents/context_providers/neo4j_graphrag/main.py	Implements the runnable Python GraphRAG sample (Foundry chat client + Neo4j context provider).
python/pyrightconfig.samples.py310.json	Excludes the new sample path from pyright sample checking.
python/pyrightconfig.samples.json	Excludes the new sample path from pyright sample checking.
dotnet/samples/02-agents/AgentWithRAG/README.md	Adds the Neo4j GraphRAG sample entry to the AgentWithRAG index.
dotnet/samples/02-agents/AgentWithRAG/AgentWithRAG_Step05_Neo4jGraphRAG/README.md	Documents the new .NET Neo4j GraphRAG sample setup and run steps.
dotnet/samples/02-agents/AgentWithRAG/AgentWithRAG_Step05_Neo4jGraphRAG/Program.cs	Implements the .NET GraphRAG sample (Azure OpenAI + Neo4j provider).
dotnet/samples/02-agents/AgentWithRAG/AgentWithRAG_Step05_Neo4jGraphRAG/AgentWithRAG_Step05_Neo4jGraphRAG.csproj	Defines the new sample project and its package references.
dotnet/Directory.Packages.props	Adds centrally-managed versions for Neo4j packages used by the sample.
dotnet/agent-framework-dotnet.slnx	Adds the new sample project to the solution index.

[eavanvalkenburg]

couple of notes on the python version, nothing major

[eavanvalkenburg]

the python side looks good, thanks @ltwlf one note on the neo4j package, we have embedding clients in MAF as well, could be reused in your package.