alivirgo/major-ai-skills/use-bolding-and-bullet-formatting

┌─────────────────────────────────────────────────────────────┐
│                 Attention Salience Mapping                  │
│                                                             │
│  Buried in a Paragraph:                                     │
│  "Write an email to my team about the sprint delay make it  │
│   sound positive don't blame QA and keep it under 60 words" │
│  ↳ 40% probability of missing the word limit or QA rule     │
│                                                             │
│  Bold Key-Value Anchors:                                    │
│ - **Goal**: Announce 2-day sprint delay to engineering     │
│ - **Tone**: Positive and accountable                       │
│ - **Negative Rule**: ❌ Do NOT blame QA or testing         │
│ - **Hard Limit**: Strictly under 60 words                  │
│  ↳ 100% Deterministic Constraint Compliance                 │
└─────────────────────────────────────────────────────────────┘

### 📋 Task: [1-Sentence Direct Command]
 
### 🎯 Parameters & Constraints:
-**Target Audience**: [e.g. Senior Leadership / New Hires]
-**Desired Tone**: [e.g. Direct, Warm, Technical, Executive]
-**Output Format**: [e.g. 3-column Markdown Table / 4-bullet list]
-**Length Ceiling**: [e.g. Max 75 words / 1 page]
-**Prohibited Terms**: [e.g. No corporate buzzwords, no emojis]

Write a PostgreSQL schema migration:
 
### Target Changes:
-**Table**: `users`
-**New Enum Type**: `user_tier` ('free', 'pro', 'enterprise')
-**New Column**: `tier` (Type: `user_tier`, Default: `'free'`, Nullable: `FALSE`)
-**Indexing Requirement**: **`CONCURRENTLY`** (Must not take exclusive table locks)
-**Output**: Pure SQL migration script only; zero chat commentary.

-- Safe, non-blocking zero-downtime enum and index migration
CREATE TYPE user_tier AS ENUM ('free', 'pro', 'enterprise');
 
ALTER TABLE users 
ADD COLUMN tier user_tier NOT NULL DEFAULT 'free';
 
CREATE INDEX CONCURRENTLY idx_users_tier ON users(tier);