when-to-use-this-skill

Produce “when to use this skill” documentation + examples for developers, aligned to the Agent Skills concept.

References (must be cited/derived from these pages only):
- https://developers.openai.com/codex/skills/
- https://agentskills.io/home

Output structure (markdown):
1) Summary (2–4 bullets): what this skill is for and what it improves
2) Optimal usage moments: map to lifecycle phases
3) Example library (minimum 12 examples), presented as a table with columns:
   - Phase
   - Goal
   - Inputs required (files, constraints, audience, format)
   - Raw prompt (before)
   - Optimized prompt (after) — include placeholders like {context}, {inputs}, {constraints}, {acceptance_criteria}, {format}, {deadline}
   - Acceptance criteria (how to judge the optimized prompt is “good”)
4) Non-goals / anti-patterns: 5 cases where the skill should NOT be used

Rules:
- Keep tone developer-neutral and execution-oriented.
- Use realistic SDLC phases and include at least 2 examples per major phase.