Patch release covering three small surface-polish fixes spotted in the v1.6.1 README + docs walk. No new API surface; no breaking changes; every component renders byte-identical to v1.6.1.

### Changed

- **`README.md` — removed the "Tests" CI badge.** The badge image returned 404 and rendered as broken on every README view. May return in a future release if a green-build signal can be sourced cleanly; for now, removing the broken image is the honest choice.

### Fixed

- **`<x-wirekit::code-block>` copy-button cursor.** The toolbar copy button rendered without a `cursor: pointer` on hover, leaving keyboard / mouse users unsure whether it was clickable. Added `cursor-pointer` to the button class — hover state now signals interactivity unambiguously, matching every other interactive control in WireKit.
- **`docs/cli/wirekit-doctor.md` — "Common failures and fixes" section restructured.** The four subsection headings previously embedded the literal doctor command output (with `⚠` / `i` glyphs and inline-code backticks at H3 size), which rendered awkwardly on docs.wirekit.app — small icons forced to heading scale, monospace at heading weight. Each subsection now uses a descriptive title (e.g. "Sans font mismatch") and quotes the exact doctor line in a `text` code block in the body. Reads cleanly at every viewport.