CRAP delta reporting in Review Council (Group 2c)

[jflowers]

Summary

Add a change-impact section to gaze-reporter.md that computes and reports CRAP score deltas between the base and PR branches as part of the Review Council review.

RFC: https://github.com/orgs/unbound-force/discussions/483 — Group 2c
Phase: 2 (Accessibility)

Context

The Review Council already uses gaze-reporter.md to analyze code quality. This enhancement adds a dedicated section that shows how CRAP scores changed for functions touched in the PR.

Implementation

Change-Impact Section in gaze-reporter.md

• Compute CRAP scores on the base branch and the PR branch
• Diff the scores for all functions touched in the PR
• Present as a table: function name, base CRAP, PR CRAP, delta, verdict
• Highlight functions that crossed thresholds (improved past or degraded past)

Verdict Integration

• CRAP improvements contribute to a positive review signal
• CRAP degradations trigger warnings or change requests
• Net CRAP delta summarized in the review

Acceptance Criteria

• gaze-reporter.md updated with a change-impact section
• CRAP delta computed between base and PR branches
• Per-function delta table included in review output
• Functions crossing thresholds highlighted
• Net CRAP delta summarized
• Integrated into Review Council verdict logic

Dependencies

• Depends on: Pre-change CRAP gate (Group 2b) — for changed-function identification
• Related: divisor-entropy agent (Group 2a)
• Repo: unbound-force