patterns: add missing English AI-writing pattern examples

[devswha]

Goal

Add evidence-backed examples for English AI-writing patterns that are currently under-documented.

Why

Pattern contributions are easier when every pattern has a failing example and a successful rewrite.

Suggested scope

• Pick 2-3 English patterns under patterns/en-*.md or examples/en-* that need clearer examples.
• Add one failure example and one success example per pattern.
• Prefer real recurring model habits over one-off awkward sentences.

Acceptance criteria

• Each added example includes a source-like Before and a meaning-preserving After.
• The rewrite removes the pattern without inventing new claims.
• npm test still passes.