Report stage skill

[savitharaghunathan]

Part of #54.

Report

Generates a final migration report summarizing what was done, what remains, and quality assessment.

Consumes	.konveyor/results.json (all entries), .konveyor/eval.json, PLAN.md, git diff
Produces	.konveyor/report.md, .konveyor/results.json entry
Image	agent-plan (lightweight, no build toolchain needed)
Mode	Non-interactive

Expected artifact

.konveyor/report.md — human-readable migration report covering:

• Migration summary (what was migrated, from/to)
• Steps completed vs skipped
• Build and test status
• Fix iterations applied
• Quality score from eval
• Remaining work / known issues
• Diff stats

Could also produce structured output for the UI.

Tasks

• Define report.md structure
• Create skills/report/SKILL.md
• Decide if report produces structured JSON alongside markdown (for UI consumption)
• Supersedes current handoff.md written by the harness