Python: Fix Copilot Studio constructor in package guide

[LI (ktz03)]

Motivation & Context

The Copilot Studio package guide passes bot_identifier to CopilotStudioAgent, which raises TypeError before construction. The constructor accepts agent_identifier.

Description & Review Guide

• What are the major changes? Replace the obsolete keyword with agent_identifier and use an agent-schema placeholder in the existing example.
• What is the impact of these changes? The example follows the implemented constructor. Runtime code is unchanged. Windows local construction with a placeholder token and an explicit-client control passed using current source; authentication, agent execution, cloud services, package builds, and the full suite were not run.
• What do you want reviewers to focus on? The example's keyword and schema-name placeholder match the constructor.

Related Issue

N/A - trivial change: an obvious correction of an unsupported keyword in existing documentation, with no runtime or API change.

AI Assistance

• No material AI assistance was used.
• This is an AI-assisted contribution. I reviewed, understood, and verified all submitted content and accept responsibility for it.

AI assistance details: Documentation, local verification, and PR description.

Contribution Checklist

• The code builds clean without any errors or warnings
• All unit tests pass, and I have added new tests where possible
• The PR follows the Contribution Guidelines
• This PR links to an agreed issue with no competing open PR, or the Related Issue section documents a trivial-change or repository-automation exception.
• This is not a breaking change. If it is a breaking change, add the breaking change label (or add "[BREAKING]" to the title prefix, before or after a language prefix such as Python: or .NET:) — a workflow keeps the label and title prefix in sync automatically.

[Copilot]

🟢 Approval recommended

The documentation-only correction matches the constructor signature and parameter semantics, with no unresolved findings.

No open issues 🎉

What changed in this PR

Corrects the Copilot Studio package guide to match the implemented constructor. Runtime code is unchanged.

Changes:

• Replaces bot_identifier with agent_identifier.
• Uses a placeholder that indicates an agent schema name.

File	Description
python/​packages/​copilotstudio/​AGENTS.md	Corrects the constructor keyword and placeholder in the example.

_{Review effort: Balanced}