feat(agentchat): allow scoped AgentTool metadata

[maxpetrusenkoagent]

Why are these changes needed?

AgentTool previously always exposed the wrapped agent's full name and description as the caller-facing tool metadata. That makes it awkward to present a narrower, task-specific delegated capability surface in multi-agent pipelines without mutating the wrapped agent itself.

This PR adds optional, keyword-only name and description overrides to AgentTool, matching the existing TeamTool pattern. The defaults stay unchanged and old serialized configs continue to omit these fields. The README example now calls out that these fields are prompt-visible metadata only, not an authorization boundary, and that least-privilege execution still requires separately scoped tools or workbenches on the wrapped agent.

This is intentionally not a full capability-token implementation. It is a small compatibility and documentation hardening step for the delegation concern raised in #7528.

Related issue number

Refs #7528

Checks

• I've included any doc changes needed for https://microsoft.github.io/autogen/. See https://github.com/microsoft/autogen/blob/main/CONTRIBUTING.md to build and test documentation locally.
• I've added tests (if relevant) corresponding to the changes introduced in this PR.
• I've made sure all auto checks have passed.

Verification

• RED: uv run pytest packages/autogen-agentchat/tests/test_task_runner_tool.py::test_agent_tool_component_with_scoped_tool_metadata -q failed before implementation with TypeError: AgentTool.__init__() got an unexpected keyword argument 'name'.
• GREEN: uv run pytest packages/autogen-agentchat/tests/test_task_runner_tool.py -q → 8 passed.
• uv run ruff check packages/autogen-agentchat/src/autogen_agentchat/tools/_agent.py packages/autogen-agentchat/tests/test_task_runner_tool.py → passed.
• uv run pyright packages/autogen-agentchat/src/autogen_agentchat/tools/_agent.py packages/autogen-agentchat/tests/test_task_runner_tool.py → 0 errors.
• uv run mypy --config-file pyproject.toml packages/autogen-agentchat/src/autogen_agentchat/tools/_agent.py packages/autogen-agentchat/tests/test_task_runner_tool.py → success.
• uv run poe lint && uv run poe pyright && uv run poe mypy from python/packages/autogen-agentchat → passed.
• uv run poe test from python/packages/autogen-agentchat → 377 passed, 5 skipped.
• uv run python check_md_code_blocks.py ../README.md from python → README code blocks OK.
• Codex autoreview on the final diff → CLEAN.

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[maxpetrusenkoagent]

Verification update after opening draft PR:\n\n- Exact GitHub PR diff saved via gh pr diff 7836 and reviewed with Codex in read-only mode: CLEAN.\n- GitGuardian Security Checks: pass.\n- license/cla: still queued/pending after a 5 minute watch.\n- Local verification remains: autogen-agentchat package tests passed (377 passed, 5 skipped), lint/pyright/mypy passed, README code blocks passed.