ci: replace Blacksmith runners with GitHub-hosted runners

[sunnylqm]

Replace Blacksmith-hosted GitHub Actions runners with GitHub-hosted equivalents.

• blacksmith-4vcpu-ubuntu-2404 → ubuntu-latest
• blacksmith-6vcpu-macos-26 → macos-26

No workflow logic is changed beyond runner selection.

Summary by CodeRabbit

• Chores
  • Updated the environments used for automated build, test, lint, and failure-notification workflows.
  • No changes were made to the checks or notification steps.

[coderabbitai]

Navigate logical layers of code changes, visualize relationships, and explore their blast radius.

Note

Currently processing new changes in this PR. This may take a few minutes, please wait...

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Advanced

Run ID: 0a16d976-091d-4ca2-a01f-e22dcc27582d

📥 Commits

Reviewing files that changed from the base of the PR and between a393802 and 4c49a5b.

📒 Files selected for processing (5)

• .github/workflows/ci-failure-email.yml
• .github/workflows/e2e_android.yml
• .github/workflows/e2e_ios.yml
• .github/workflows/lint.yml
• .github/workflows/test.yml

 ______________________________________________________
< Your merge request walked so code reviews could run. >
 ------------------------------------------------------
  \
   \   (\__/)
       (•ㅅ•)
       / 　 づ

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Commit to this branch
• Create a new PR

• Autopilot · Keep fixing CodeRabbit findings and required CI, and resolving merge conflicts

Autopilot is currently an internal CodeRabbit preview.

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands.}