chore(ci): drop an orphaned workflow

[jan-kubica]

• Removes a scheduled workflow whose shared caller no longer exists; every run failed at startup.

Summary by CodeRabbit

• Chores
  • The scheduled and manually triggered AI shared-update workflow has been removed. The automated update and validation process will no longer run, and credentials will no longer be passed to it. No changes to end-user product functionality are included in this release.

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Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-28T07:15:52.697322Z	42afaf2	PR opened

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository: stella/tooling/.coderabbit.yaml

Review profile: CHILL

Plan: Advanced

Run ID: 57a3e6c5-8533-49bb-87a3-8a13589ecabc

📥 Commits

Reviewing files that changed from the base of the PR and between 4de198e and 42afaf2.

📒 Files selected for processing (1)

• .github/workflows/ai-shared-update.yml

💤 Files with no reviewable changes (1)

• .github/workflows/ai-shared-update.yml

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📜 Recent review details

⏰ Context from checks skipped due to timeout. (6)

• GitHub Check: cla / cla
• GitHub Check: Enforce package quarantine / Enforce package quarantine
• GitHub Check: rust-lints
• GitHub Check: Changeset present for published package changes
• GitHub Check: Check generated AI instructions
• GitHub Check: checks

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📝 Walkthrough

Walkthrough

The weekly and manually dispatched AI Shared Update workflow was removed. It called a pinned reusable workflow, used ai-sync.yml for validation, and supplied changelog app credentials.

Changes

AI shared update workflow

Layer / File(s)	Summary
Remove the update workflow .github/workflows/ai-shared-update.yml	The weekly and manual workflow definition was deleted. It granted write permissions, called the pinned stella/.github reusable workflow with ai-sync.yml validation, and supplied changelog app credentials.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~3 minutes

Change: Other

Merge Risk: ⚪ Minimal · up to 42afa

No actionable merge-blocking risk is identified from the workflow removal; it is ready to merge after normal checks.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: removing an orphaned CI workflow.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Commit to this branch
• Create a new PR

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