Add education coverage matrix (docs/coverage/education.md)

[kmadan]

Goal

Add `docs/coverage/education.md` mapping every policy under `industry_specific/education/v1/` to its source obligation. Follow the format of docs/coverage/eu-ai-act.md.

Why this matters

Education is one of the highest-scrutiny AI use cases (proctoring, automated grading, instructional-tool vetting, student data handling). GOPAL ships 12 policies in this vertical but no map exists for contributors to see what's covered or what's missing. A coverage matrix unblocks the next wave of education-specific contributions.

What to cite

Each row should cite the source: FERPA (20 USC § 1232g, 34 CFR Part 99), COPPA (15 USC § 6501–6506, 16 CFR Part 312), state-level AI proctoring laws (e.g., Illinois BIPA, NY ed-tech rules), and relevant ETS/AERA standards. The proctoring policy at `responsible_ai_proctoring.rego` is implemented — see also `examples/education-proctoring/` for a runnable demo.

Existing packages to cover

• `academic_integrity/`
• `assessment_and_evaluation/` — includes implemented `responsible_ai_proctoring` and `human_in_the_loop_grading`
• `fairness_and_equity/`
• `safe_learning_environment/` — includes `age_appropriate_content` and `instructional_tool_vetting`
• `student_data_privacy/` — includes implemented `coppa_compliance`, `data_minimization`, `ferpa_compliance`

Acceptance criteria

• Matrix lists every education policy file
• Each row marks Implemented / Scaffold / Planned
• docs/coverage/README.md links to the new matrix
• At least one "📋 Planned" row identifies a real gap (e.g., AI grading bias evaluation, IEP/504 accommodations, biometric consent under BIPA)

Get help

This is mostly a reading task — no Rego required. Ed-tech or compliance background welcome but not required.