fix: add null assertions to resolve BCP318 warnings in Bicep files

[irwins]

Purpose

• ...

Does this introduce a breaking change?

[ ] Yes
[ ] No

Pull Request Type

What kind of change does this Pull Request introduce?

[ ] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Documentation content changes
[ ] Other... Please describe:

How to Test

• Get the code

git clone https://github.com/Azure-Samples/functions-markdown-agent.git
cd functions-markdown-agent
git checkout [branch-name]
python -m pip install -r src/requirements.txt

• Test the code

What to Check

Verify that the following are valid

• ...

Other Information

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[irwins]

No comment

[anthonychu]

Thanks @irwins! Can you please complete the contributor agreement so that we can merge this?

---

Tested this PR on a fresh Foundry deployment (gpt-5.1-codex-mini, VNet enabled, West US) — Bicep provisioned cleanly with the ! null assertions, no BCP318 warnings.

Changes applied before merging:

• Removed .vscode/mcp.json (pointed to contributor-specific deployment URL) and .vscode/settings.json (personal IDE preferences) in commit 8b136f0.

What was kept:

• ✅ Bicep null assertion fixes (api.bicep, storage-PrivateEndpoint.bicep, main.bicep)
• ✅ README improvements (.env guidance, glow terminal rendering, multi-turn curl examples)
• ✅ test/test.cloud.http improvements ($dotenv for secrets, auto-captured session ID)

Test results:

• MCP docs search (Microsoft Learn): ✅ returned comprehensive Azure Functions pricing docs
• Multi-turn conversation: ✅ session persistence works after timeout recovery
• VNet + Private Endpoints: ✅ deployed and functional