feat(dev-env): shell scripts (git-hooks, worktree, deploy, regtest, nav) and smoke test

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

modules/dev-env/scripts/lib.sh

@@ -0,0 +1,24 @@
+# dev-env — shared config-loader library.
+#
+# Installed at /etc/dev-env/lib.sh and sourced by the shell-function
+# modules (nav / worktree / pr-helpers / regtest). Holds the runtime
+# config loader that was previously copy-pasted into each module.
+#
+# Side-effect-free at top level (function definitions only): it is
+# sourced into interactive shells and may be re-sourced freely, so it
+# must stay idempotent and must not clobber the user's environment.
+# Colours deliberately live in lib-colors.sh (sourced only by the
+# standalone bins) so they don't leak into interactive shells.
+
+# Load the rendered runtime config (DEV_ROOT, REPOS_DIR, deploy targets,
+# …) into the current shell. Safe to call repeatedly.
+_devenv_source_config() {
+    if [[ -r /etc/dev-env/config.sh ]]; then
+        # shellcheck disable=SC1091
+        source /etc/dev-env/config.sh
+    fi
+}
+
+# Default loader used by the navigation / worktree / PR modules.
+# regtest.sh overrides this to layer on its own path defaults.
+_devenv_load_config() { _devenv_source_config; }