chore: add concrete patterns, remove mandatory skill invocation

[CybotTM]

Quality Review Finding

Per marketplace tracking issue, this skill has critical quality issues:

Word count: 300 (but 95% are reference pointers)

Issues

1. No actual pattern content — skill is 95% pointers to reference files, with almost no concrete patterns in the body
2. Invalid "Required Workflow" mandate — "For comprehensive reviews, ALWAYS invoke these related skills" violates skill independence principle. A skill should work standalone; invoking other skills is the agent's decision
3. Empty "Quick Reference" — headings like "Type Safety: Avoid interface{}" without examples
4. Weak description — "Production-grade Go development patterns" is vague

Recommended Actions

• Remove "Required Workflow" section entirely
• Add 2-3 concrete pattern examples directly in the skill (not hidden in references)
• Add "Quick Reference" with annotated code snippets showing core principles
• Rewrite description: "Use when implementing Go services, designing resilient systems, setting up test suites, or optimizing performance."