feat(runbook): add Sprint 3 Day 2 verification script for NLP keyword extraction and text normalisation

[AAdewunmi]

Summary

Adds the Sprint 3 Day 2 console-only verification runbook for NLP keyword extraction and text normalisation.

Changes

• Added docs/sprint-runbook/sprint-3/sprint-3-day-2.sh.
• Made the script executable.
• Verifies current NLP files and consolidated NLP test files exist.
• Confirms the obsolete mixed keyword test file is absent.
• Runs Docker/PostgreSQL startup, Django checks, inline NLP behaviour assertions, targeted NLP tests, insights tests, and the full regression suite.

Behaviour

• Validates text normalisation, tokenisation, stop-word filtering, source hash stability, deterministic keyword ranking, alphabetical tie-breaking, keyword limits, and low-information input handling.
• Confirms AI/NLP contract headings are present.
• Produces a final receipt when all checks pass.

Why

Provides a repeatable Sprint 3 Day 2 verification path for the deterministic NLP keyword extraction and text-processing work.

Validation

• bash -n docs/sprint-runbook/sprint-3/sprint-3-day-2.sh
• ./docs/sprint-runbook/sprint-3/sprint-3-day-2.sh

Result

Runbook completed successfully:

• Targeted NLP tests: 14 passed
• Insights tests: 23 passed
• Full project suite: 138 passed

Notes

The AI/NLP contract check is a heading-level smoke check, not a semantic document audit.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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