docs: Record test outcomes and document testing mock limitations

[ManupaKDU]

This commit updates the documentation within .zektopic/status.md and Jules/improvements.md following a comprehensive regression test of the repository. It successfully executed frontend and Rust test suites natively. Furthermore, it identified various false-negative test failures triggered by the brittle module mocks in test_runner.py and provided an actionable roadmap to fix backend testing by mandating Docker-based executions moving forward.

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PR created automatically by Jules for task 2787885512588480618 started by @manupawickramasinghe

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[github-actions]

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[manupawickramasinghe]

Closing: auto-generated test-status log that only appends to the same .zektopic/Jules report files as the other open log PRs; they conflict sequentially and add no code changes. Test outcomes are tracked via #275.