Add source ranking to tests and tooling

[imDarshanGK]

Improve the tests and tooling with source ranking.

Acceptance criteria:

• Implement the change in the tests and tooling.
• Add or update tests, docs, or validation for the touched path.

[prasiddhi-105]

Hiii please assign this issue to me, i would love to work under your project!

[arcgod-design]

Hi @imDarshanGK! I'd love to work on this Hard-level issue as part of SSoC 2026 👋

My Approach:

• Implement source ranking logic in tests and tooling: rank retrieved sources by relevance score, recency, and domain authority
• Add tests verifying that ranking produces deterministic, correct orderings for given inputs
• Test edge cases: equal scores, empty sources, single source, and tie-breaking behavior
• Update validation/docs for the touched path

Could you please assign this to me (@arcgod-design)? Thank you!