[Design Doc] Muhammad Maaz — Section 3: Technical Approachadd draft technical approach section for factual_grounding, relevance…

[Maazkorejo]

What does this PR do?

Adds a draft of Section 3 (Technical Approach) for the design document, covering the technical approach for all four evaluation criteria I own: factual_grounding, relevance, refusal_check, and completeness.

Which module(s) does it touch?

docs/section3_technical_approach.md — new file, no existing code touched. This is a design document draft, not an implementation PR; no source modules exist yet per the Week 1 no-code rule.

How did you test it?

No automated tests apply since this is documentation, not code. The claims in this section are backed by manual verification: I ran sentence-transformers (all-MiniLM-L6-v2) locally against two hand-picked (response, context) pairs — a paraphrase and a factual contradiction — and included the actual cosine similarity scores (0.982 and 0.822) in the appendix, rather than assuming the model's behavior.

Edge cases handled:

The document itself identifies edge cases the eventual implementation will need to handle: numeric/factual contradictions that still score high on cosine similarity (verified with real data), refusal-adjacent phrases like "I cannot stress enough how important this is" that shouldn't trigger refusal_check, and the more open-ended limitations of prompt-decomposition for completeness. These are documented as known risks, not yet solved in code.

Checklist:

• Tests added or updated — N/A, documentation only
• Docstrings on all new public functions — N/A, no functions in this PR
• No unused imports — N/A
• README updated if public API changed — N/A, no API changes
• Lead Engineer has reviewed and approved before submitting to director — pending, this is a draft for team review before the Day 7 design doc submission

[Maazkorejo]

Closing this in favor of the combined design doc — team decided to consolidate all sections into one file instead of separate PRs per section. Section 3 content has been carried over intact: see #2 (or whatever PR number the combined one gets).