Add SemVer versioning (1.0.0)v1.0.0

Bake a PROJECT_VERSION="1.0.0" const into every script (test-build,
install.sh, and the three image-builder/*.sh). test-build and install.sh
expose -V/--version; the image-builder scripts already use --version for
the Slackware target, so their project-version flag is -V only. bootstrap.sh
handles -V before its root check so it is queryable as any user.

No VERSION file: a release bump is one sed over the consts, anchored on
^PROJECT_VERSION= so it never hits the SBo package VERSION/OPT_VERSION vars.
Release procedure documented in CLAUDE.md; user-facing note in README.

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

1 files changed, 4 insertions, 0 deletions

diff --git a/test-build b/test-build
index eb4009f..54a8da4 100755
--- a/test-build
+++ b/test-build
@@ -23,6 +23,8 @@
 #
 # No em dashes in prose by author convention.
 
+PROJECT_VERSION="1.0.0"   # bump via sed across all scripts; see CLAUDE.md Releases
+
 # =============================================================================
 # CONFIG (do not edit here; real values live in the external config file)
 # =============================================================================
@@ -75,6 +77,7 @@ USAGE:
 
 OPTIONS:
   -h, --help    This text.
+  -V, --version Print version and exit.
   --stable      Target Slackware 15.0 (image + tree). Default is -current.
   --dry-run     Resolve, apply overrides, print the build order, do not build.
   --yes         Skip the confirm prompt (the order is still printed first).
@@ -90,6 +93,7 @@ parse_args() {
   while [[ $# -gt 0 ]]; do
     case "$1" in
       -h|--help) usage; exit 0 ;;
+      -V|--version) echo "test-build $PROJECT_VERSION"; exit 0 ;;
       --stable|15.0) VERSION_ID="15.0"; shift ;;
       --dry-run) DRY_RUN=1; shift ;;
       --yes) ASSUME_YES=1; shift ;;