[docs-drift] Document gh-aw-upgrade-check internal workflow

[github-actions]

Recent code changes in the repository have introduced documentation drift. The following changes need corresponding documentation updates.

Changes Requiring Documentation Updates

1. New gh-aw-upgrade-check internal workflow is undocumented

Commit(s): 319d6a3 (PR #19)
What changed: A new gh-aw-upgrade-check workflow was added in .github/workflows/gh-aw-upgrade-check.md and .github/workflows/gh-aw-upgrade-check.lock.yml. This is an internal-only scheduled workflow (no shim in gh-agent-workflows/) that runs on weekdays to check for new gh-aw releases and file issues tagged [gh-aw-upgrade]. It imports scheduled-report/rwx.md, the same reusable prompt used by docs-drift.
Documentation impact: The workflow is not mentioned in any documentation file. It should be documented in gh-agent-workflows/DEVELOPING.md since that file covers the architecture, internal workflows, and the scheduled-report/rwx.md reusable prompt pattern. Specifically:

• The architecture tree in gh-agent-workflows/DEVELOPING.md (line 7-27) should note that gh-aw-upgrade-check exists as an internal-only workflow in .github/workflows/ that also imports scheduled-report/rwx.md
• The "Reusable prompts" section (line 53-64) already uses docs-drift.md as the example; it would be helpful to mention gh-aw-upgrade-check as a second consumer to illustrate the reuse pattern
• Consider documenting it in root DEVELOPING.md alongside the repository structure table, or in a note about internal workflows that live directly in .github/workflows/

Note: This workflow is correctly omitted from the consumer-facing tables in README.md and gh-agent-workflows/README.md since it's not installable via gh aw add.

Suggested Actions

• Add gh-aw-upgrade-check to gh-agent-workflows/DEVELOPING.md — mention it as an internal workflow that uses the scheduled-report/rwx.md reusable prompt, alongside docs-drift
• Consider adding a brief note in root DEVELOPING.md about internal-only workflows that live directly in .github/workflows/ (like gh-aw-upgrade-check, ci.yml, release.yml)

Generated by Docs Drift

[strawgate]

/ai please make a PR

[github-actions]

✅ Mention In Issue completed successfully!

[github-actions]

Created a PR to address this documentation drift:

gh-agent-workflows/DEVELOPING.md — added gh-aw-upgrade-check to the architecture tree and the reusable prompts section (as a second scheduled-report/rwx.md consumer alongside docs-drift), with a note that it's internal-only.

Root DEVELOPING.md — added a note about internal-only workflows (gh-aw-upgrade-check.md, ci.yml, release.yml) that live directly in .github/workflows/.

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