Dev/steven/update convo history examples

[steven10a]

• Updating examples to follow best practice of not appending messages until guardrails run
• Added this guidance to the quickstart

[Copilot]

Pull Request Overview

This PR updates conversation history management in examples to follow best practices by only appending messages after guardrails validation succeeds, preventing blocked messages from polluting conversation context.

Key changes:

• Modified examples to pass user input inline without mutating conversation history first
• Added messages to history only after successful guardrail validation
• Added explicit documentation in quickstart explaining this pattern

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
examples/basic/multiturn_with_prompt_injection_detection.ts	Refactored to defer adding user/assistant/tool messages to history until after guardrails pass
examples/basic/local_model.ts	Updated to append conversation history only after successful guardrail validation
examples/basic/azure_example.ts	Modified to maintain conversation history and only update after guardrails pass
examples/basic/agents_sdk.ts	Changed to update thread history only after successful agent execution
docs/quickstart.md	Added new section explaining multi-turn conversation best practices with guardrails

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[gabor-openai]

TY!