[self-care:open-source-failures] Fix recurring activation artifact upload failures in gh-aw-workshop

`githubnext/gh-aw-workshop` has a recurring activation-stage failure while uploading the activation artifact. Bounded evidence shows the same failing step across 5 workflows, which suggests shared activation or artifact-handling logic rather than isolated workflow defects.

**Action:** The `githubnext/gh-aw-workshop` maintainer should inspect the shared activation artifact upload path and fix the common upload preconditions; accept when new runs for the listed workflows complete the `Upload activation artifact` step successfully.

Agent prompt
Investigate the shared activation logic used by workshop workflows and fix the common cause of `Upload activation artifact` failures. Focus on artifact naming, path creation, permissions, and any shared reusable workflow or action inputs used during activation. Keep the fix bounded to artifact upload reliability and verify by rerunning the affected workflows.

- Severity: P1
- Normalized signature: `Upload activation artifact`
- Representative runs:
- https://github.com/githubnext/gh-aw-workshop/actions/runs/33950420537
- https://github.com/githubnext/gh-aw-workshop/actions/runs/33950380965
- https://github.com/githubnext/gh-aw-workshop/actions/runs/33950041261
- Affected workflows: `.github/workflows/title-similarity-review.lock.yml`, `.github/workflows/workshop-builder.lock.yml`, `.github/workflows/workshop-link-checker.lock.yml`, `.github/workflows/workshop-order-review.lock.yml`, `.github/workflows/workshop-ui-screenshots.lock.yml`.
- Probable cause: more evidence is required, but the shared failing step supports a common activation artifact upload defect.
- Confidence: medium
- Bounded fix: repair the shared artifact upload path or configuration used by these workflows and confirm the activation stage succeeds.

### Control Plane
- Correlation ID: `33953401010-208`
- Central repository: `githubnext/gh-aw-cao`
- Control-plane run: https://github.com/githubnext/gh-aw-cao/actions/runs/33953401010

> Generated by [SelfCare / Open Source Failures](https://github.com/githubnext/gh-aw-cao/actions/runs/33953558843) · pi · gpt54 · 21 AIC · ⌖ 8.47 AIC · ⊞ 8.3K · [◷](https://github.com/search?q=repo%3Agithubnext%2Fgh-aw-cao+is%3Aissue+%22gh-aw-workflow-call-id%3A+githubnext%2Fgh-aw-cao%2Fself-care-open-source-failures%22&type=issues)
> - [x] expires on Sep 19, 2026, 7:53 AM UTC