docs: Add CLAUDE.md for AI assistant guidance

[wolram]

Add comprehensive documentation for AI assistants working on this codebase:

• Architecture overview with directory structure and design patterns
• Development commands for Python (uv/poe) and .NET (dotnet)
• Code conventions, linting rules, and preferred libraries
• CI/CD workflow reference
• Known TODOs and quick start guide

Motivation and Context

Description

Contribution Checklist

• The code builds clean without any errors or warnings
• The PR follows the Contribution Guidelines
• All unit tests pass, and I have added new tests where possible
• Is this a breaking change? If yes, add "[BREAKING]" prefix to the title of the PR.

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[wolram]

ok

[Copilot]

Pull request overview

Adds a repository-root CLAUDE.md intended to guide AI assistants contributing to the Agent Framework repo, summarizing architecture, dev commands, conventions, CI workflows, and contributor quick start.

Changes:

• Introduces an AI-assistant guide covering repo structure and core design patterns.
• Documents Python (uv/poe) and .NET (dotnet) development workflows and quality gates.
• Adds quick-reference tables for conventions, preferred libraries, and CI workflows.

[Copilot]

The directory listing includes Microsoft.Agents.AI.Hosting*/ with a literal *, which looks like an unintended wildcard and doesn’t match an actual path. Consider listing the concrete Microsoft.Agents.AI.Hosting/ directories (e.g., Microsoft.Agents.AI.Hosting/, Microsoft.Agents.AI.Hosting.A2A/, etc.) or remove the * to avoid confusion.

Suggested change

	│ │ └── Microsoft.Agents.AI.Hosting*/
	│ │ └── Microsoft.Agents.AI.Hosting/

[Copilot]

“Known TODOs (101 total)” is a hard-coded count that will drift as TODOs are added/removed and can quickly become inaccurate. Prefer removing the exact number (or replace with a command/link to generate the count) so this section stays evergreen.

Suggested change

	## Known TODOs (101 total)
	## Known TODOs

[Copilot]

Markdown tables are written with a double leading pipe (e.g., || ADR | Topic |), which renders as an extra empty first column in standard Markdown. Use a single leading | for each row (and update the other tables in this doc that follow the same pattern).

[eavanvalkenburg]

@wolram thanks for this, but we have already setup a bunch of AGENTS.md and wish to use that more generic name, rather then a claude specific one, it is also two projects side by side and not just a dotnet one, so dotnet specific instructions should be in the dotnet folder.