📖 Wiki improvement opportunities found while writing tests

## Comment template

```markdown
**Wiki page:** [PageName](https://gmodwiki.com/PageName)
**Finding:** One or two sentences describing the actual behavior discovered.
**What the wiki says:** What is missing, wrong, or ambiguous on the page.
**Pinned by test:** `lua/tests/gmod/unit/path/to/File.lua` (test case name)
**Suggested wiki edit:** Concrete text or callout (Note/Warning/Bug) to add.
```

One comment per finding. When a finding results in an actual wiki edit, react to the comment with 🎉 or reply noting it was applied, so we can track what's been upstreamed.

Start by reading the relevant pinned Lua test, using the path and test case named for each finding. Use the provided comment template to record the wiki page, behavior, discrepancy, and suggested edit; done means each finding is posted and any applied wiki edit is acknowledged with 🎉 or a reply.

Written by the indexing model from the issue text.