[Lucas1479]

What and why

GitHub retired the macOS 14 hosted images on November 2, 2026. The macOS voice and MPS jobs now stop before checkout with The configuration 'macos-14-arm64-us-default' is not supported, including a targeted retry while validating #294.

Move those two jobs to the supported macOS 15 Apple Silicon image and update the matching installation-profile reference. This restores the existing CI coverage without changing application requirements or dependency pins. See the official retirement notice.

Linked Issue for product-semantic or public-contract changes: none (CI maintenance).

Change class

• Routine fix, documentation, test, maintenance, or presentation-only UI
• Product-semantic or public-contract change discussed in the linked Issue
• Isolated, default-off experiment

Owning layer: GitHub Actions runner selection.
User-visible effect: none in the application; macOS validation can execute again.
Compatibility or migration impact: CI uses macOS 15 instead of the retired macOS 14 image.

Evidence

• Parsed both workflow files as YAML and verified the voice/MPS runner selections.
• git diff --check: passed.
• All 15 GitHub Actions checks passed, including the macOS 15 voice workflow and MPS installation candidate, Linux contracts, Windows Python suites, Electron builds, and packaged application smoke/recovery checks.