Repo settings hygiene: unused wiki, no topics

**What** — Wiki is enabled and empty; the repo has no topics.

**Why it matters here** — One visit to Settings. An empty wiki on a public repo reads as a docs home that does not exist; no topics means the SDK does not surface in topic search.

**Evidence**

```
$ gh api repos/Comfy-Org/comfy-python-sdk -q '"wiki=\(.has_wiki) topics=\(.topics|length)"'
wiki=true topics=0
```

**Fix**

Settings → General: disable Wiki. Add topics: `comfyui`, `sdk`, `python`, `api-client`.

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Found by `repo-audit` during repo improvement sweep 2026-08-17. Parent: #53