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>

1 files changed, 3 insertions, 1 deletions

diff --git a/CLAUDE.md b/CLAUDE.md
index 854d529..c539d4b 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -95,6 +95,8 @@ Test coverage:
 | T39 | `-R` empty answer — kept (default) |
 | T40 | `-R` answer S — matched hint unchanged |
 | T41 | `-R` no matched rows — "nothing to review", exit 0 |
+| T42 | `--check` single pkg — nvchecker called with `-e <pkg>` |
+| T43 | `--check` two pkgs — nvchecker full scan, no `-e` |
 
 When adding new features, add a corresponding test case to `tests/mkhint_test.sh`.
 
@@ -106,7 +108,7 @@ When adding new features, add a corresponding test case to `tests/mkhint_test.sh
 - `--hintfile` with no `-v`: queries nvchecker for latest version, shows current vs. latest, prompts to accept/override/decline. After accepting, runs `nvtake` to sync nvchecker's keyfile.
 - `--list` / `-l`: lists hints with `HintVer`/`SBOVer`; rows where the two are byte-equal are highlighted (color only on a TTY; plain when piped). Adds a legend when any row matched.
 - `--review` / `-R`: iterates only the matched (highlighted) hints. For each, shows the hint side-by-side with its `.info` (`git diff --no-index` if git present, else `diff -y`), then prompts `[K]eep / [D]elete / [S]kip` (default Keep). Delete removes the hint and its `.bak` via `_remove_hint`. Prints a deleted/kept summary. `-l` and `-R` combine: `-lR` shows the table first, then reviews. No matches → "nothing to review", exit 0.
-- `--check` / `-C`: runs nvchecker for all (or named) hints, reports outdated packages with current → latest versions, prompts per-package to update, applies updates with `nvtake`, then prompts single `slackrepo update` for all updated packages. Hints with no `[pkg]` section in `nvchecker.toml` are collected and, after the scan, a single prompt offers to populate the config via `add_nvchecker_section` (github/pypi autodetect, else stub); on accept it prints a "review and re-run" message and stops the run without applying updates. Packages whose `.info` is not found in `REPO_DIR` are skipped.
+- `--check` / `-C`: runs nvchecker for all (or named) hints. With exactly one explicit package it uses `nvchecker -e <pkg>` to skip scanning the whole config; with two+ packages or no args it does one full scan. (`--hintfile` with no `-v` also queries via `nvchecker -e <pkg>`.) reports outdated packages with current → latest versions, prompts per-package to update, applies updates with `nvtake`, then prompts single `slackrepo update` for all updated packages. Hints with no `[pkg]` section in `nvchecker.toml` are collected and, after the scan, a single prompt offers to populate the config via `add_nvchecker_section` (github/pypi autodetect, else stub); on accept it prints a "review and re-run" message and stops the run without applying updates. Packages whose `.info` is not found in `REPO_DIR` are skipped.
 - `--no-dl` / `-N`: downloads and recalculates checksums as normal, then appends `NODOWNLOAD=yes` after `MD5SUM_x86_64=`. Works with `--hintfile` or `--new`. Error if used alone.
 - `--delete` / `-d`: removes hint file and `.bak` if present. Accepts multiple package names. Exits 2 on first missing file.
 - Downloads go to `/tmp/mkhint/download` (single shared temp file, deleted after md5 calculation).