[Infrastructure] Speed up CI pipeline with parallel job execution and caching

[Penielka]

Overview

Identify bottlenecks in the CI pipeline and implement optimizations to reduce total pipeline time.

Acceptance Criteria

• Audit current CI pipeline timings
• Increase parallelization where dependencies allow
• Optimize npm/cargo cache usage
• Use matrix builds for test splitting
• Target: CI completes in under 10 minutes
• Cache hit rate monitoring

Priority: Medium

Faster feedback loops improve developer productivity.

[JamesEjembi]

i would like to work on this issue

[grantfox-oss]

🦊 GrantFox — @JamesEjembi has been assigned to this issue as part of the Official Campaign | FWC26 campaign!

Next steps:

1. Open a Pull Request referencing this issue (e.g., Closes #278)
2. Your PR will be reviewed by the AetherEdu maintainers

Good luck! Track your progress on GrantFox.

[grantfox-oss]

🎉 This issue has been marked as completed on GrantFox as part of the Official Campaign | FWC26 campaign!

@JamesEjembi's PR #353 was approved and merged by @Penielka.

🏆 @JamesEjembi: You earned 35 FoxPoints for this contribution! Your current tier: Explorer (659 total points). Track your full progress on GrantFox.

👏 Great work, @JamesEjembi! Keep contributing to AetherEdu.