Migrate open .github pull request titles to plain outcome wording #2690

Problem

The basefoundry/.github repository has GitHub Issues disabled, but it can still contain open pull requests whose titles follow the old category-prefix convention. Track its migration from the Base repository and do not enable Issues as a side effect.

Expected behavior

After the accepted templates and organization-config adoption are active, inventory every open PR in basefoundry/.github and rename it to plain outcome/problem wording. Closed and merged PR titles remain historical. If no open PR exists, record that evidence and close this task with a reasoned no-op.

Scope and non-goals

Scope: Metadata-only title migration for open PRs in basefoundry/.github.

Non-goals: Do not enable repository Issues, create an issue in .github, change branch policy, or edit closed/merged titles.

Affected areas

• Open pull request titles in basefoundry/.github.
• Base tracker: Track implementation of the accepted Base governance plan #2665.
• Accepted source: Revise the Base ecosystem governance design and implementation plan #2664.

Impact and evidence

1. Product intent: No product behavior change.
2. Architecture and contracts: Applies the accepted title rule to the special org-config profile.
3. User guidance: No user content change; inventory open PRs.
4. CLI/API and reference: No CLI change.
5. Operations and safety: Keep Issues disabled and preserve org-level settings.
6. Validation and testing: Read back each changed PR title and compare counts.
7. Examples and downstream use: No examples affected; no source examples in this metadata-only task.
8. Governance and contributor process: Apply the shared plain-title contract through a repo-local PR linked to this Base issue.
9. Decision records: No new decision.
10. Release notes: Reasoned none; metadata-only change.

Open questions

• Confirm templates and title rules are live before execution; ambiguous titles remain unchanged and get separate clarification issues.

Plan

• S1: One PR in basefoundry/.github, linking this issue by full URL because Issues are disabled in the target repo.
• Dependencies: Base issue form Use one issue form and a reviewed Ready checklist #2667, PR template Define the pull request template and documentation-impact contract #2669, and .github adoption Adopt the governance profile in the organization configuration repository #2685.
• Acceptance criteria:
  • Inventory all open PRs at execution time; no issue inventory is expected because Issues are disabled.
  • Rename all clear category-prefixed titles to plain outcome/problem wording; record before/after counts and mapping.
  • Leave ambiguous titles unchanged and leave closed/merged PRs untouched.
  • Keep the .github Issues-disabled setting unchanged.
• Validation: Read back PR titles and inspect the repository setting; compare inventory counts.
• Risks and rollback: Org-level templates affect many repos; preserve title mapping and restore any incorrect title exactly.
• Decision impact: No new decision is accepted.