claude-api skill description truncated in Claude Code listings

The `claude-api` skill's `description` field in frontmatter exceeds 250 characters, which causes Claude Code to truncate it in the skill listing.

What Claude Code sees in context:

```
claude-api: Build apps with the Claude API or Anthropic SDK.
TRIGGER when: code imports `anthropic`/`@anthropic-ai/sdk`/`claude_agent_sdk`, or user asks to use Claude API, Anthropic SDKs, or Agent SDK.
DO NOT TRIGGER when: code imports `openai`/other AI SDK, ge…
```

The `DO NOT TRIGGER when` conditions are cut off, which means Claude may incorrectly invoke this skill when working with non-Anthropic AI SDKs.

Per the [Claude Code docs on skills](https://docs.anthropic.com/en/docs/claude-code/skills#skill-files), descriptions longer than 250 characters are truncated in skill listings to reduce context usage. The fix would be to shorten the description to under 250 chars, front-loading the key use case and keeping the exclusion conditions concise.