* ci: add dependabot for uv-managed Python projects
Configure weekly dependency updates for the two uv projects in the
repo — tools/yt-design-extractor and plugins/plugin-eval. Minor and
patch bumps are grouped per-project so each ecosystem produces at most
one rollup PR per week; majors arrive as individual PRs.
Native uv support is available in Dependabot since 2024 — it updates
pyproject.toml and uv.lock in lock-step.
* deps: drop include:scope to avoid double-parenthesized commit subject
With prefix "deps(yt-design-extractor)" + include:"scope", dependabot
would render commits as "deps(yt-design-extractor)(uv): bump foo from
1 to 2" — double parens. Drop include:scope on both ecosystem entries;
project identity stays in the prefix. Caught by the claude-code-review
workflow on PR #545.