chore(hooks): skip test suite in pre-commit when no shell files staged

`bin/pre-commit` now scans `git diff --cached` for `.sh`/`.bash`/CLI
files; if none are staged it runs `make lint` only and skips the
multi-minute test/parallel + shellcheck pass. Saves docs-only commits
~1-3 min.

Author: Chemaclass

CHANGELOG.md

@@ -12,6 +12,7 @@
 - Guard root `package.json` against accidental regression of the docs-split: assert no `dependencies`/`devDependencies`/`peerDependencies`/`scripts` blocks ever return to the published manifest
 - `release.sh` now treats `docs/package.json` as a first-class `RELEASE_FILES` entry, so the release flow backs it up, restores it on rollback, and stages it without inline duplication. Backup/restore preserves nested directory paths
 - Slim `bashunit::runner::run_test` (~320 lines) by extracting nine pure helpers (`source_login_shell_profiles`, `print_verbose_test_summary`, `export_test_identity`, `apply_interpolated_title`, `detect_runtime_error`, `extract_subshell_type`, `format_subshell_output`, `compute_total_assertions`, `extract_encoded_field`) so the hot path reads as a sequence of named steps. Pure refactor, no behavior change
+- Pre-commit hook (`bin/pre-commit`) skips the test suite when no `.sh`/`.bash`/CLI files are staged, falling back to `make lint` only — docs-only commits no longer pay the multi-minute test cost
 - Centralize all ANSI escape emission through the existing `_BASHUNIT_COLOR_*` constants. `src/coverage.sh` and the `--watch` screen-clear in `src/main.sh` no longer hardcode escape sequences (#247)
 - Speed up coverage report generation (#636): combine executable + hit counting into a single source-file pass (`bashunit::coverage::compute_file_coverage` shared across text/lcov/html reporters), collapse the per-line non-executable pattern checks in `is_executable_line` into a single combined `grep`, replace `echo | sed`/`grep` subshells in `extract_functions` with bash-native regex and parameter expansion, swap per-line `sed` lookups for pre-loaded indexed arrays in `get_hit_lines`/`generate_file_html`, and cache pre-computed file stats across reports
 

bin/pre-commit

@@ -1,8 +1,17 @@
 #!/usr/bin/env bash
 echo "Running pre-commit checks"
 
-make pre_commit/run
-EXIT_CODE=$?
+CHANGED_SHELL_FILES=$(git diff --cached --name-only --diff-filter=ACMR \
+  | grep -E '(\.(sh|bash)$|^bashunit$|^bin/)' || true)
+
+if [ -n "$CHANGED_SHELL_FILES" ]; then
+    make pre_commit/run
+    EXIT_CODE=$?
+else
+    echo "No shell files changed; running lint only."
+    make lint
+    EXIT_CODE=$?
+fi
 
 if [ "${EXIT_CODE}" -ne 0 ]; then
     echo "Pre Commit checks failed. Please fix the above issues before committing"