feat: Add anti-slop skill for AI content quality control

Add comprehensive anti-slop skill for detecting and eliminating generic AI-generated patterns:

- New skill directory: skills/anti-slop/
  - SKILL.md: Main documentation with workflows
  - README.md: Overview and quick start guide
  - references/: Pattern catalogs for text, code, and design
    - text-patterns.md: Natural language slop patterns
    - code-patterns.md: Programming antipatterns
    - design-patterns.md: Visual/UX design slop patterns
  - scripts/: Python detection and cleanup tools
    - detect_slop.py: Automated slop detection (scoring 0-100)
    - clean_slop.py: Automated cleanup with safety features

- Updated skills/_INDEX.md:
  - Added "Quality & Content Review" category (1 skill)
  - Added to discovery patterns by technology/task/domain
  - Added to skill combination examples
  - Added to quick reference table
  - Updated total skills count: 132 → 133
  - Updated last modified date: 2025-10-23

- Updated CLAUDE.md:
  - Added anti-slop to skills catalog (132 → 133 total)
  - Added "Quality & Content Review" category
  - Added to quick category reference
  - Updated quality standards date

Key features:
- Detects overused AI phrases, buzzwords, meta-commentary
- Identifies generic code patterns (variable names, comments)
- Recognizes cookie-cutter design patterns
- Provides automated text cleanup with backups
- Comprehensive pattern catalogs for manual review
- Cross-cutting quality improvement across all content types

Author: rand

CLAUDE.md

@@ -493,8 +493,8 @@ open https://ui.shadcn.com/themes
 **Old approach**: Monolithic skills `/zig-dev`, `/modal-dev` (too large)
 **New approach**: Atomic, composable skills (~300 lines avg, <500 line guideline)
 
-### Quality Standards (as of 2025-10-18)
-- ✅ **132 skills** with YAML frontmatter (agent_skills_spec.md compliant)
+### Quality Standards (as of 2025-10-23)
+- ✅ **133 skills** with YAML frontmatter (agent_skills_spec.md compliant)
 - ✅ **0 future dates** - all dates validated by CI
 - ✅ **Automated testing** - code syntax validation in CI
 - 🔄 **Size optimization** - 89 skills >500 lines identified for splitting
@@ -531,15 +531,16 @@ Read zig-memory-management.md, zig-testing-patterns.md
 Read beads-workflow.md + beads-context-strategies.md + beads-multi-session-patterns.md
 ```
 
-### Skills Catalog (132 Total)
+### Skills Catalog (133 Total)
 
-**Core Categories** (74 skills):
+**Core Categories** (75 skills):
 - **API Design** (7): REST, GraphQL, auth/authz, rate limiting, versioning, error handling
 - **Testing** (6): Unit, integration, e2e, TDD, coverage, performance testing
 - **Containers** (5): Dockerfile optimization, Compose, security, networking, registries
 - **Frontend** (8): React patterns, Next.js App Router, state/data/forms, a11y, performance, SEO
 - **Database** (11): Postgres (optimization, migrations, schema), MongoDB, Redis, Redpanda/Kafka streaming, Apache Iceberg, DuckDB analytics, pooling, ORMs, selection
 - **Workflow & Tasks** (5): Beads workflow, context strategies, multi-session, dependency management
+- **Quality & Content Review** (1): Anti-slop detection and cleanup (text, code, design)
 - **Meta Skills** (4): Skill discovery and planning for repositories and prompts
   - Discovery: `skill-repo-discovery.md` (analyze repos), `skill-prompt-discovery.md` (analyze prompts)
   - Planning: `skill-repo-planning.md` (plan repo skills), `skill-prompt-planning.md` (plan prompt skills)
@@ -578,6 +579,7 @@ DevOps/Infra:   cicd/ (5) | infrastructure/ (6) | observability/ (5)
 Data:           data/ (5) | realtime/ (4)
 Specialized:    modal-*.md (8) | swiftui-*.md, swift-*.md, ios-*.md (6) | zig-*.md (6)
 Workflow:       beads-*.md (4) | tui-*.md (5) | network-*.md (5)
+Quality:        anti-slop/ (1 skill + 3 reference guides + 2 scripts)
 Meta:           skill-*.md (5 including skill-creation.md)
 Formal:         formal/z3-*.md, formal/sat-*.md, formal/smt-*.md (3) | formal/lean-*.md (4) | formal/csp-*.md (3)
 ML:             ml/unsloth-*.md, ml/llm-*.md, ml/lora-*.md (4) | ml/diffusion-*.md (3)
@@ -601,7 +603,7 @@ Mobile:         mobile/react-native-*.md (4)
 4. **Deep dive?** Search `skills/_INDEX.md` by technology/task/problem domain
 5. **Emergency?** Read relevant skill directly: `skills/api-*.md`, `skills/cicd/*.md`
 
-**Full catalog**: `skills/_INDEX.md` (132 skills, workflows, search patterns, combinations)
+**Full catalog**: `skills/_INDEX.md` (133 skills, workflows, search patterns, combinations)
 
 ### Skill Quality Assurance
 All skills now include:

skills/_INDEX.md

@@ -128,6 +128,25 @@ This index catalogs all atomic skills available in the skills system, organized
 
 ---
 
+### Quality & Content Review (1 skill)
+
+| Skill | Use When | Lines |
+|-------|----------|-------|
+| `anti-slop/SKILL.md` | Detecting/eliminating AI-generated patterns (slop) in text, code, design; content quality review; preventing generic outputs | ~420 |
+
+**Common workflows:**
+- Content review: Read `anti-slop/SKILL.md` → Run detection scripts → Apply cleanup → Manual review
+- Code cleanup: Read `anti-slop/references/code-patterns.md` → Identify patterns → Refactor
+- Design review: Read `anti-slop/references/design-patterns.md` → Audit against patterns → Recommendations
+
+**Key features:**
+- Automated text slop detection and cleanup scripts
+- Comprehensive pattern catalogs for text, code, and design
+- Quality principles for authentic, non-generic content
+- Integration with development workflows
+
+---
+
 ### Meta Skills (4 skills)
 
 | Skill | Use When | Lines |
@@ -489,6 +508,7 @@ This index catalogs all atomic skills available in the skills system, organized
 **TUI (Rust):** Search `ratatui-*.md`, `tui-*.md`
 **Zig:** Search `zig-*.md`
 **Beads:** Search `beads-*.md`
+**Quality & Content:** `anti-slop/SKILL.md`, `anti-slop/references/*.md`
 **Meta Skills:** Search `skill-*.md`
 **CI/CD:** Search `cicd/*.md`, `github-*.md`, `ci-*.md`, `cd-*.md`
 **Infrastructure:** Search `infrastructure/*.md`, `terraform-*.md`, `aws-*.md`, `kubernetes-*.md`, `cloudflare-*.md`
@@ -528,6 +548,12 @@ This index catalogs all atomic skills available in the skills system, organized
 - iOS: `ios-testing.md`
 - Zig: `zig-testing.md`
 
+**Content quality review:**
+- AI slop detection/cleanup: `anti-slop/SKILL.md`
+- Text patterns: `anti-slop/references/text-patterns.md`
+- Code patterns: `anti-slop/references/code-patterns.md`
+- Design patterns: `anti-slop/references/design-patterns.md`
+
 **Networking:**
 - iOS: `ios-networking.md`
 - Secure: `mtls-implementation.md`, `tailscale-vpn.md`
@@ -571,6 +597,7 @@ This index catalogs all atomic skills available in the skills system, organized
 **API Development:** `rest-api-design.md`, `graphql-schema-design.md`, `api-authentication.md`, `api-rate-limiting.md`
 **DevOps/SRE:** `cicd/*.md`, `infrastructure/*.md`, `observability/*.md`, `cost-optimization.md`, `heroku-*.md`, `netlify-*.md`
 **Data Engineering:** `data/*.md`, `stream-processing.md`, `batch-processing.md`, `data-validation.md`
+**Content Quality:** `anti-slop/SKILL.md` (text, code, design quality review and cleanup)
 **Real-time Systems:** `realtime/*.md`, `websocket-implementation.md`, `server-sent-events.md`, `pubsub-patterns.md`
 **Formal Methods:** `formal/z3-*.md`, `formal/lean-*.md`, `formal/sat-*.md`, `formal/smt-*.md`, `formal/csp-*.md`
 **Machine Learning:** `ml/unsloth-*.md`, `ml/diffusion-*.md`, `ml/llm-*.md`, `ml/stable-diffusion-*.md`
@@ -738,6 +765,13 @@ This index catalogs all atomic skills available in the skills system, organized
 4. `skill-prompt-planning.md` - Plan missing skills from prompts
 5. `skill-creation.md` - Create new skills
 
+### Content Quality Review
+1. `anti-slop/SKILL.md` - Understand slop patterns & workflows
+2. Run detection: `python scripts/detect_slop.py <file>`
+3. Review findings manually with reference guides
+4. Apply automated cleanup: `python scripts/clean_slop.py <file> --save`
+5. Manual refinement and verification
+
 ---
 
 ## Quick Reference Table
@@ -786,24 +820,28 @@ This index catalogs all atomic skills available in the skills system, organized
 | Find skills for prompt | skill-prompt-discovery.md | 1 |
 | Plan new skills | skill-repo-planning.md or skill-prompt-planning.md, skill-creation.md | 1→2 |
 | Create new skill | skill-creation.md | 1 |
+| Review content for AI slop | anti-slop/SKILL.md | 1 |
+| Clean up generic code | anti-slop/references/code-patterns.md | 1 |
+| Review design quality | anti-slop/references/design-patterns.md | 1 |
 
 ---
 
 ## Total Skills Count
 
-- **132 atomic skills** across 27 categories
+- **133 atomic skills** across 28 categories
 - **Average 310 lines** per skill
 - **100% focused** - each skill has single clear purpose
 - **Cross-referenced** - related skills linked for discoverability
 
 ### By Category Breakdown
-**Core Foundation** (74 skills):
+**Core Foundation** (75 skills):
 - API Design: 7 skills
 - Testing: 6 skills
 - Containers: 5 skills
 - Frontend: 8 skills
 - Database: 11 skills
 - Workflow & Task Management: 5 skills
+- Quality & Content Review: 1 skill (anti-slop detection and cleanup)
 - Meta Skills: 4 skills (skill discovery and planning)
 - iOS/Swift: 6 skills
 - Modal.com: 8 skills (6 original + 2 troubleshooting)
@@ -849,6 +887,6 @@ See `MIGRATION_GUIDE.md` for detailed mapping.
 
 ---
 
-**Last Updated:** 2025-10-18
-**Total Skills:** 129
+**Last Updated:** 2025-10-23
+**Total Skills:** 133
 **Format Version:** 1.0 (Atomic)