Add daily GitHub repo digest Functions sample

[paulyuk]

Summary

• Update the sample concept to a daily GitHub repo digest for Azure/azure-functions-host
• Preserve Azure Functions hosting, function_app.py, host.json, requirements.txt, and Copilot SDK runtime conventions
• Add a timer-triggered daily digest path for 9 AM Pacific using public GitHub REST APIs
• Keep the existing /api/ask chat/API behavior and update docs plus local config examples
• Keep the main README focused on clone, restore, run, and azd up; move MCP extension notes into MCP-extension-notes.md

Validation

• uv sync
• uv run python -m py_compile function_app.py chat.py
• Public GitHub REST API smoke check for Azure/azure-functions-host
• Direct smoke test of _repo_digest_context('Azure/azure-functions-host') / MCP tool payload path with local imports

[lilyjma]

A couple of small fixes for the _run_digest function.

[lilyjma]

Suggest removing local.settings.json from .gitignore. Including a default version in the repo makes local development smoother — users can clone and run immediately without being prompted about the stack they need. More importantly, the file created from the prompt is missing AzureWebJobsStorage, so running the app would error.

{
  "IsEncrypted": false,
  "Values": {
    "AzureWebJobsStorage": "UseDevelopmentStorage=true",
    "FUNCTIONS_WORKER_RUNTIME": "python"
  }
}

[lilyjma]

Suggest adding a step here to start Azurite before running the function, since it's required for local storage emulation (AzureWebJobsStorage):

3. Start Azurite (in a separate terminal):

azurite --skipApiVersionCheck --silent --location ./.azurite

[paulyuk]

Addressed Lily's feedback in e4e0f0d: fixed the Copilot SDK call shape, changed session cleanup to disconnect(), committed a default local.settings.json with AzureWebJobsStorage, and added the Azurite local-dev step.