Add agentic workflow for documentation consistency

[laiapat]

Description

See laiapat#3 for implementation in my fork; tracking issue #45674.

All SDK Contribution checklist:

• The pull request does not introduce [breaking changes]
• CHANGELOG is updated for new features, bug fixes or other significant changes.
• I have read the contribution guidelines.

General Guidelines and Best Practices

• Title of the pull request is clear and informative.
• There are a small number of commits, each of which have an informative message. This means that previously merged commits do not appear in the history of the PR. For more information on cleaning up the commits in your PR, see this page.

Testing Guidelines

• Pull request includes test coverage for the included changes.

[Copilot]

Pull request overview

Adds a GitHub Agentic Workflows (gh-aw) based automation to periodically check repository documentation for inconsistencies and open a PR with fixes, along with local/dev setup support for running the workflow tooling.

Changes:

• Adds a doc consistency check gh-aw workflow source (.md) and its compiled GitHub Actions workflow (.lock.yml).
• Updates developer tooling/config to support running gh-aw (VS Code MCP config + Copilot setup workflow).
• Treats generated workflow lock files as generated in .gitattributes.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 8 comments.

Show a summary per file

File	Description
.vscode/mcp.json	Adds an MCP server entry for gh-aw tooling.
.github/workflows/doc-consistency-check.md	Defines the gh-aw workflow prompt/instructions and frontmatter config.
.github/workflows/doc-consistency-check.lock.yml	Compiled GitHub Actions workflow that runs the agent and creates PRs via Safe Outputs.
.github/workflows/copilot-setup-steps.yml	Installs gh-aw CLI support in the Copilot setup workflow.
.github/aw/actions-lock.json	Adds an actions lock manifest for gh-aw-related actions.
.github/agents/agentic-workflows.agent.md	Adds an agent definition/dispatcher doc for gh-aw usage.
.gitattributes	Marks workflow lock files as generated and configures merge behavior.

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