chore: scaffold ai-coding-skills repository structure

docs/requirements-gate.md

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+# Requirements Gate
+
+For any skill that depends on external skill sets (e.g., Superpowers), enforce these rules:
+
+## Mandatory Prerequisite Section in SKILL.md
+
+Include a `Prerequisites` section that states:
+
+- required dependency repo
+- required skill names
+- what happens if requirements are missing
+- exact remediation steps
+
+## Runtime/Flow Behavior
+
+If requirements are missing:
+
+1. Stop execution.
+2. Return a concise blocking message.
+3. Provide exact install/setup steps.
+4. Ask for confirmation once requirements are installed.
+
+## Suggested Block Message
+
+```text
+Cannot run <skill-name> yet.
+Missing required Superpower skills: <list>
+Install from: https://github.com/obra/superpowers
+After installation, tell me "requirements ready" and I’ll continue.
+```
+
+## Compatibility Requirement
+
+Each skill must declare support for:
+
+- Codex
+- Claude Code
+- OpenCode
+
+If one platform is unsupported, state it explicitly.