fix(skills): add Anti-Patterns and fix descriptions for remaining skills (batch 2)

Processed 24 skills: pr-description-writer through tax-planning-checklist.
Added Anti-Patterns sections to all 24 skills.
Added Required Inputs section to product-launch-checklist.
Rewrote descriptions for retro-analysis, substack-notes-scraper, and sycophancy-challenger.

https://claude.ai/code/session_01MuGKn3a3Gbqoe8uM5Lmuqt

skills/process-documentation/SKILL.md

@@ -83,6 +83,14 @@ Next review due: [Date]
 - [ ] Escalation path is named (specific people or roles, not just "your manager")
 - [ ] Review date is set
 
+## Anti-Patterns
+
+- [ ] Do not write steps without specifying who is responsible for each — ownership must be explicit throughout
+- [ ] Do not omit the escalation path — every process must say what happens when something goes wrong
+- [ ] Do not document the ideal process if the real process differs — document reality, then note improvements separately
+- [ ] Do not skip edge cases and exceptions — they are where most process failures actually occur
+- [ ] Do not produce documentation without a review date — undated process docs quickly become incorrect
+
 ## Example Trigger Phrases
 - "Document this process: [description]"
 - "Write a process guide for [workflow]"