Phase 1 — Entry depth: add example_bad/good + concrete detection

[lcasarin-maker]

Problem

All 338 wiki files are auto-generated, template-stamped (12�15 lines), zero code examples, no before/after, no real detection criteria.

Tasks

• Extend YAML schema + wiki generator: example_bad, example_good, detection, evidence[]
• Prioritize ~40 high severity entries first
• Generator visibly marks stub vs deep entries
• Deduplicate 5 high-similarity pairs (VC-024/028, VC-069/082, VC-025/051) with redirects