docs: bring wiki current with v0.4.0 Updates every page for the security layer, the five indexability-contradiction gates, Google rich-result validation, on-page accessibility gates, and the per-layer scoring model that replaced the flat 100-point budget. Regenerates Finding-Reference from the registry (48 -> 67 ids), recounts the failOn enum (28 -> 42 gate names), and adds Security-Layer and Contradictions with a real, verified true positive against danluu.com. Removes every version-numbered --write promise in favour of naming the condition it ships under.