Add AI product anti-patterns to anti-patterns.md

[glacierphonk]

Summary

Adds an AI Product Anti-Patterns section to anti-patterns.md, documenting 6 patterns specific to naming AI products themselves. Distinct from the existing AI Name Slop section, which covers names generated by AI.

Patterns covered:

1. The "AI" prefix/suffix epidemic (AIWriter, CopyAI, JasperAI, …)
2. The "Co-" / "-pilot" imitation (post-Copilot saturation)
3. The human name trend (Claude/Gemini work, "Sarah" inside a CRM doesn't)
4. The "magic" cliche (every 2023-2024 pitch deck)
5. The "smart" prefix (redundant for AI products)
6. The "neural" / "neuro" prefix (architecture decoration with no user-facing meaning)

Each pattern explains the failure mode and, where applicable, the narrow situation in which it remains valid. Cross-referenced with AI Name Slop at top of file to clarify the two distinct failure modes share aesthetics but require different fixes.

Scope

• One file modified: anti-patterns.md (+71 lines)
• Section placed after The "So What?" Test as a standalone domain-specific section
• Style matches existing The Five Fatal Flaws prose pattern (### per pattern, examples + why it fails + when it works)
• markdownlint-cli2 '**/*.md' passes (0 errors)

Closes #169

Test plan

• markdownlint-cli2 '**/*.md' passes
• Verify section renders cleanly on GitHub
• Verify intra-doc anchor links resolve (#ai-name-slop, #filler-word-first-position)