[34] Add EAS production build workflow

[EmeditWeb]

Problem

There is no automated EAS build pipeline. Every release requires the maintainer to manually run eas build --platform android --profile production and upload the APK, which delays releases and risks human error.

Context

Releases gated by manual steps don't happen on schedule. Automating production builds on v* tag push means tagging a commit produces a downloadable APK with zero further action.

Before Starting

Read these context files first:

• context/architecture-context.md
• context/code-standards.md
• context/progress-tracker.md
• eas.json

What To Build

1. Create .github/workflows/eas-build.yml.
2. Trigger: push with tags: ['v*'].
3. Job production-android: ubuntu-latest, Node 20.
4. Steps: checkout → setup-node → npm ci → install eas-cli → eas build --platform android --profile production --non-interactive --no-wait.
5. Auth via EXPO_TOKEN secret (must be added in repo settings — document in workflow comment).
6. After job, run eas build:list --json and download APK, upload as release asset via actions/upload-release-asset.

Files To Touch

• .github/workflows/eas-build.yml
• eas.json (verify production profile exists)
• README.md (release process section)

Acceptance Criteria

• Pushing tag v0.1.0 triggers an EAS production build
• APK is attached to the corresponding GitHub release
• EXPO_TOKEN secret is documented as required
• No secrets leaked in logs
• eas.json has a production profile with buildType: apk or aab
• Release process documented in README

Mandatory Checks Before PR

• CI passes on a test PR before merging
• Zero secrets committed to the repo
• context/progress-tracker.md updated

[K1NGD4VID]

Hello maintainer, i would like to work on this issue

[grantfox-oss]

🦊 GrantFox — @K1NGD4VID has been assigned to this issue as part of the Official Campaign campaign!

Next steps:

1. Open a Pull Request referencing this issue (e.g., Closes #10)
2. Your PR will be reviewed by the StepFi-app maintainers

Good luck! Track your progress on GrantFox.