perf: scan single nvchecker entry with -e for single-package checksHEADmaster

When --check is given exactly one package, and when --hintfile suggests a
version without -v, run `nvchecker -e <pkg>` so only that entry is scanned
instead of the whole nvchecker.toml. Two+ packages or no args still do one
full scan, since nvchecker -e accepts only a single entry.

Add T42/T43 (mock nvchecker now logs its args), and update CLAUDE.md and
README.md (including the previously undocumented -R/--review and -l highlight).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

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