Gemma4 and dep upgrades

[madebygps]

Ollama model update:

• Changed the default Ollama model from qwen3.5:9b to gemma4:e2b in .devcontainer/ollama/devcontainer.json, .env-sample, .env.sample.ollama, agents/agentframework_http.py, agents/agentframework_learn.py, agents/langchainv1_github.py, and agents/langchainv1_http.py to ensure consistency across development, environment configuration, and runtime code. [1] [2] [3] [4] [5] [6] [7]

• Updated documentation in both English and Spanish README.md files to reflect the new default model (gemma4:e2b) for Codespaces setup instructions. [1] [2]

Dependency updates:

• Upgraded langchain-core, langchain, langchain-openai, and langchain-mcp-adapters to newer versions in pyproject.toml for improved compatibility and features.

Development environment improvements:

• Modified the postCreateCommand in .devcontainer/ollama/devcontainer.json to include uv run prek install, ensuring necessary pre-commit hooks or dependencies are installed on container creation.

Prompt improvements:

• Changed the example query in agents/agentframework_learn.py to a more relevant Azure web app hosting comparison.
• Updated the agent creation in agents/langchainv1_github.py to use the system_prompt parameter instead of prompt for clarity and correctness.

[Copilot]

Pull request overview

Updates the project’s default Ollama model to gemma4:e2b across devcontainer setup, environment samples, docs, and runtime agent code, and bumps LangChain-related dependencies to newer patch versions.

Changes:

• Switched the default Ollama model from qwen3.5:9b to gemma4:e2b in env samples, devcontainer config, docs, and agent implementations.
• Upgraded LangChain-family dependencies (langchain, langchain-core, langchain-openai, langchain-mcp-adapters) and refreshed uv.lock.
• Enhanced the Ollama devcontainer postCreateCommand to install prek hooks during container creation.

Show a summary per file

File	Description
uv.lock	Locks updated LangChain/LangGraph patch versions and dependency specifiers.
pyproject.toml	Raises minimum versions for LangChain-related dependencies.
.devcontainer/ollama/devcontainer.json	Pulls gemma4:e2b by default and runs uv run prek install on create.
.env-sample	Updates default OLLAMA_MODEL to gemma4:e2b.
.env.sample.ollama	Updates default OLLAMA_MODEL to gemma4:e2b for Ollama setup.
README.md	Codespaces instructions updated to reference gemma4:e2b.
spanish/README.md	Spanish Codespaces instructions updated to reference gemma4:e2b.
agents/langchainv1_http.py	Updates Ollama default model used by ChatOpenAI.
agents/langchainv1_github.py	Updates Ollama default model and switches agent creation to system_prompt.
agents/agentframework_http.py	Updates Ollama default model used by OpenAIResponsesClient.
agents/agentframework_learn.py	Updates Ollama default model and refreshes the example query text.

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