Verify stage skill

[savitharaghunathan]

Part of #54.

Verify

Builds the project, parses compiler errors, applies conservative fixes, iterates.

Consumes	Migrated source files, PLAN.md (verification section), domain skill references (/opt/skills/*/references/)
Produces	Fix patches committed to branch, .konveyor/results.json entry with build/test summary
Image	agent-verify-{lang} (e.g. agent-verify-java)
Mode	Non-interactive

Expected artifact

Fix patches committed to the branch. Results entry includes build status, fix iterations, and test summary.

{"stage": "verify", "status": "succeeded", "summary": "build passed after 2 fix iterations, 38/40 tests passing"}

Tasks

• Fix iteration cap via KONVEYOR_PARAM_MAX_FIX_ITERATIONS (default 3)
• Compiler errors only — do not fix test failures
• Ensure domain skill references are consumed for error-fix mappings
• Report remaining errors in results.json reason if build still fails after max iterations