feat(installer): add next integration lane (#686)

Add --next installer flag (build-from-source at the next integration branch; MOSAIC_NEXT=1 env equiv; explicit --ref wins). Three-lane install docs (stable @latest / --next prerelease / --dev source) + @next dist-tag pipeline design doc. Green PR-event CI 1626 + review-of-record APPROVE (head 3a5c12a5).

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

tools/install.sh

@@ -16,6 +16,9 @@
 #   --framework       Install/upgrade framework only (skip npm CLI)
 #   --cli             Install/upgrade npm CLI only (skip framework)
 #   --ref <branch>    Git ref for framework archive (default: main)
+#   --next            Prerelease lane: build CLI + gateway FROM SOURCE at the
+#                     permanent next integration branch. Shorthand for --dev
+#                     with ref=next; explicit --ref/MOSAIC_REF wins.
 #   --dev             Build CLI + gateway FROM SOURCE at --ref instead of the
 #                     registry @latest. Zero registry writes — packs local
 #                     tarballs and installs them globally. Use to test a branch
@@ -31,6 +34,7 @@
 #   MOSAIC_PREFIX       — npm global prefix          (default: ~/.npm-global)
 #   MOSAIC_NO_COLOR     — disable colour             (set to 1)
 #   MOSAIC_REF          — git ref for framework      (default: main)
+#   MOSAIC_NEXT         — equivalent to --next        (set to 1)
 #   MOSAIC_DEV          — equivalent to --dev         (set to 1)
 #   MOSAIC_ASSUME_YES   — equivalent to --yes        (set to 1)
 # ──────────────────────────────────────────────────────────────────────────────
@@ -49,7 +53,12 @@ FLAG_NO_AUTO_LAUNCH=false
 FLAG_YES=false
 FLAG_UNINSTALL=false
 FLAG_DEV=false
+FLAG_NEXT=false
 GIT_REF="${MOSAIC_REF:-main}"
+GIT_REF_EXPLICIT=false
+if [[ -n "${MOSAIC_REF:-}" ]]; then
+  GIT_REF_EXPLICIT=true
+fi
 
 # MOSAIC_ASSUME_YES env var acts the same as --yes
 if [[ "${MOSAIC_ASSUME_YES:-0}" == "1" ]]; then
@@ -61,13 +70,24 @@ if [[ "${MOSAIC_DEV:-0}" == "1" ]]; then
   FLAG_DEV=true
 fi
 
+# MOSAIC_NEXT env var acts the same as --next: source build from the
+# permanent next integration branch unless MOSAIC_REF/--ref explicitly wins.
+if [[ "${MOSAIC_NEXT:-0}" == "1" ]]; then
+  FLAG_DEV=true
+  FLAG_NEXT=true
+  if [[ "$GIT_REF_EXPLICIT" == "false" ]]; then
+    GIT_REF="next"
+  fi
+fi
+
 while [[ $# -gt 0 ]]; do
   case "$1" in
     --check)          FLAG_CHECK=true; shift ;;
     --framework)      FLAG_CLI=false; shift ;;
     --cli)            FLAG_FRAMEWORK=false; shift ;;
-    --ref)            GIT_REF="${2:-main}"; shift 2 ;;
+    --ref)            GIT_REF="${2:-main}"; GIT_REF_EXPLICIT=true; shift 2 ;;
     --dev)            FLAG_DEV=true; shift ;;
+    --next)           FLAG_DEV=true; FLAG_NEXT=true; if [[ "$GIT_REF_EXPLICIT" == "false" ]]; then GIT_REF="next"; fi; shift ;;
     --yes|-y)         FLAG_YES=true; shift ;;
     --no-auto-launch) FLAG_NO_AUTO_LAUNCH=true; shift ;;
     --uninstall)      FLAG_UNINSTALL=true; shift ;;
@@ -75,6 +95,10 @@ while [[ $# -gt 0 ]]; do
   esac
 done
 
+if [[ "$FLAG_YES" == "true" ]]; then
+  export MOSAIC_ASSUME_YES=1
+fi
+
 # ─── constants ────────────────────────────────────────────────────────────────
 MOSAIC_HOME="${MOSAIC_HOME:-$HOME/.config/mosaic}"
 REGISTRY="${MOSAIC_REGISTRY:-https://git.mosaicstack.dev/api/packages/mosaicstack/npm/}"
@@ -95,6 +119,20 @@ fi
 WORK_DIR=""
 EXTRACTED_DIR=""
 
+newest_matching_file() {
+  local dir="$1"
+  local pattern="$2"
+  local matches=()
+  [[ -d "$dir" ]] || return 0
+  shopt -s nullglob
+  # shellcheck disable=SC2206 # Intentional glob expansion for caller-provided file pattern.
+  matches=("$dir"/$pattern)
+  shopt -u nullglob
+  [[ "${#matches[@]}" -gt 0 ]] || return 0
+  # shellcheck disable=SC2012 # Need portable mtime sorting across Linux/macOS.
+  ls -1t "${matches[@]}" 2>/dev/null | head -1
+}
+
 # ─── uninstall path ───────────────────────────────────────────────────────────
 # Shell-level uninstall for when the CLI is broken or not available.
 # Handles: framework directory, npm CLI package, npmrc scope line.
@@ -158,7 +196,7 @@ if [[ "$FLAG_UNINSTALL" == "true" ]]; then
     # Find most recent backup
     backup=""
     if [[ -d "$dir" ]]; then
-      backup="$(ls -1t "$dir/${base}.mosaic-bak-"* 2>/dev/null | head -1 || true)"
+      backup="$(newest_matching_file "$dir" "${base}.mosaic-bak-*")"
     fi
     if [[ -n "$backup" ]] && [[ -f "$backup" ]]; then
       cp "$backup" "$dest"
@@ -214,6 +252,16 @@ fail()  { echo "${R}✖${RESET}  $*" >&2; }
 dim()   { echo "${DIM}$*${RESET}"; }
 step()  { echo ""; echo "${BOLD}$*${RESET}"; }
 
+source_ref_details() {
+  if [[ "$FLAG_NEXT" == "true" && "$GIT_REF" == "next" ]]; then
+    echo "ref: next, --next prerelease lane"
+  elif [[ "$FLAG_NEXT" == "true" ]]; then
+    echo "ref: ${GIT_REF}, --next requested, explicit ref wins"
+  else
+    echo "ref: ${GIT_REF}"
+  fi
+}
+
 # ─── helpers ──────────────────────────────────────────────────────────────────
 
 require_cmd() {
@@ -332,8 +380,8 @@ install_cli_from_source() {
   ( cd "$src/apps/gateway"    && pnpm pack --pack-destination "$out_dir" ) 2>&1 | sed 's/^/  /'
 
   local cli_tgz gw_tgz
-  cli_tgz="$(ls -1t "$out_dir"/mosaicstack-mosaic-*.tgz 2>/dev/null | head -1)"
-  gw_tgz="$(ls -1t "$out_dir"/mosaicstack-gateway-*.tgz 2>/dev/null | head -1)"
+  cli_tgz="$(newest_matching_file "$out_dir" 'mosaicstack-mosaic-*.tgz')"
+  gw_tgz="$(newest_matching_file "$out_dir" 'mosaicstack-gateway-*.tgz')"
 
   if [[ ! -f "$cli_tgz" ]]; then
     fail "CLI tarball was not produced by pnpm pack."
@@ -388,7 +436,7 @@ if [[ "$FLAG_FRAMEWORK" == "true" ]]; then
   else
     dim "  Installed: (none)"
   fi
-  dim "  Source:    ${REPO_BASE} (ref: ${GIT_REF})"
+  dim "  Source:    ${REPO_BASE} ($(source_ref_details))"
   echo ""
 
   if [[ "$FLAG_CHECK" == "true" ]]; then
@@ -468,7 +516,7 @@ if [[ "$FLAG_CLI" == "true" ]]; then
   fi
 
   if [[ "$FLAG_DEV" == "true" ]]; then
-    dim "  Source:    ${REPO_BASE} (ref: ${GIT_REF}, build-from-source)"
+    dim "  Source:    ${REPO_BASE} ($(source_ref_details), build-from-source)"
   elif [[ -n "$LATEST" ]]; then
     dim "  Latest:    ${CLI_PKG}@${LATEST}"
   else
@@ -603,7 +651,7 @@ if [[ "$FLAG_CHECK" == "false" ]]; then
       local base dir backup_path backup_val
       base="$(basename "$dest")"
       dir="$(dirname "$dest")"
-      backup_path="$(ls -1t "$dir/${base}.mosaic-bak-"* 2>/dev/null | head -1 || true)"
+      backup_path="$(newest_matching_file "$dir" "${base}.mosaic-bak-*")"
       if [[ -n "$backup_path" ]]; then
         backup_val="\"$backup_path\""
       else
@@ -628,7 +676,7 @@ if [[ "$FLAG_CHECK" == "false" ]]; then
     NPMRC_LINES_JSON="[\"$MANIFEST_SCOPE_LINE\"]"
   fi
 
-  node -e "
+  if node -e "
     const fs = require('fs');
     const path = require('path');
     const p = process.argv[1];
@@ -653,9 +701,11 @@ if [[ "$FLAG_CHECK" == "false" ]]; then
     "$MANIFEST_CLI_VERSION" \
     "$MANIFEST_FW_VERSION" \
     "$NPMRC_LINES_JSON" \
-    "$RUNTIME_COPIES" 2>/dev/null \
-    && ok "Install manifest written: $MANIFEST_PATH" \
-    || warn "Could not write install manifest (non-fatal)"
+    "$RUNTIME_COPIES" 2>/dev/null; then
+    ok "Install manifest written: $MANIFEST_PATH"
+  else
+    warn "Could not write install manifest (non-fatal)"
+  fi
 
   echo ""
   ok "Done."