docs: exempt repository maintenance workflows from PR throttle (#4499)

* docs: exempt repository maintenance workflows from PR throttle

Keep contributor confirmation requirements while allowing verified repository-owned gh-aw maintenance runs on behalf of CODEOWNERS to create their configured PR outputs.

Assisted-by: GitHub Copilot (model: GPT-6 Astra, autonomous)

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* docs: simplify maintenance workflow confirmation exception

Limit the policy change to one sentence per document; retain existing review prioritization and author-over-cap guidance.

Assisted-by: GitHub Copilot (model: GPT-6 Astra, autonomous)

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

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Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: KSchlobohm

AGENTS.md

@@ -507,6 +507,7 @@ Disclosure is **continuous**, not a one-time event. A single AI-disclosure parag
 
 - Before opening a pull request, check whether the account that will file it already has three open pull requests in this repository.
 - If so, alert the user that additional submissions may receive lower review priority and ask for explicit permission to proceed. Do not assume consent. If the user is unavailable to provide that permission, including during autonomous or non-interactive operation, do not open the pull request. Preserve the work on a branch and report that confirmation is required.
+- Repository-owned `gh-aw` maintenance workflows are exempt from this open-PR count check and confirmation requirement.
 
 ### Commits
 

CONTRIBUTING.md

@@ -55,7 +55,7 @@ Here are a few things you can do that will increase the likelihood of your pull
 - Write a [good commit message](http://tbaggery.com/2008/04/19/a-note-about-git-commit-messages.html).
 - Test your changes with the Spec-Driven Development workflow to ensure compatibility.
 
-Accounts with three open pull requests may continue submitting changes, but additional submissions may be placed behind contributions from other authors in the review queue. Coding agents should disclose this possibility and obtain the filer's confirmation before opening another pull request.
+Accounts with three open pull requests may continue submitting changes, but additional submissions may be placed behind contributions from other authors in the review queue. Coding agents should disclose this possibility and obtain the filer's confirmation before opening another pull request. Repository-owned `gh-aw` maintenance workflows do not require this confirmation.
 
 ### Evidence gate