---
title: {Action-Oriented Title}
impact: CRITICAL|HIGH|MEDIUM-HIGH|MEDIUM|LOW-MEDIUM|LOW
impactDescription: {quantified or "prevents {problem}" impact — e.g. "O(n) to O(1)", "prevents false boundaries the data does not contain"}
tags: {prefix}, {technique-1}, {technique-2}, {concept}
---

## {Title}

{1-3 sentences explaining WHY this matters — what the viewer misreads or what breaks without
it, and what the model should generalise from. Teach the perceptual or rendering reasoning,
not just the rule. Cross-link the geohash spatial math ([[map-...]], [[nav-...]], [[qry-...]])
rather than re-deriving it; cross-link sibling rendering rules ([[encode-...]], [[gpu-...]]).}

**Incorrect ({problem label}):**

```typescript
// Production-realistic anti-pattern. Comment explains the cost.
// (Use ```css or ```typescript with JSX for the access-/CSS rules where they fit.)
```

**Correct ({solution label}):**

```typescript
// Minimal diff from the incorrect example. Comment explains the benefit.
```

**When NOT to apply:**
- {Realistic exception 1}
- {Realistic exception 2}

Reference: [{Title}]({URL}); [{Title 2}]({URL 2})
