skeleton: bring AppImage parity, scaffolded apps inherit the packaging flow

The v0.1.0 shakedown fixes for AppImage assembly (path-repo
symlink:false sed, writable-cache redirect) all landed in
examples/todo. The skeleton — which is what bin/php-qml-init copies
when scaffolding a new app — had no `appimage` target at all, so every
scaffolded app would have to either copy the example's Makefile by
hand or re-discover the same shakedown bugs.

Brings parity:

  - framework/skeleton/Makefile gains `staging-symfony` and `appimage`
    targets, mirroring the example's. Two new variables (BUNDLE_SRC,
    PACKAGING) parameterise the framework-tree paths so bin/php-qml-init
    can rewrite them at scaffold time without sed-touching the recipe.
  - framework/skeleton/packaging/skeleton.{desktop,png} added — minimum
    surface for the AppImage assembly to succeed without the user
    needing to author them.
  - framework/skeleton/Makefile's staging-symfony recipe handles both
    relative (framework default `../../php`) and absolute (post-scaffold)
    BUNDLE_SRC values via a case statement.
  - bin/php-qml-init renames packaging/skeleton.* → packaging/$NAME.*,
    rewrites the .desktop file's Name/Exec/Icon, and updates the
    Makefile's --app-name / --output / --desktop / --icon flags +
    BUNDLE_SRC + PACKAGING variables. For --vendor mode, framework's
    packaging/linux/ is also vendored to .bridge-packaging/ alongside
    the existing .bridge/ + .bridge-qml/.

Verified by scaffolding both modes:
  - non-vendored: BUNDLE_SRC + PACKAGING absolute paths
  - --vendor: BUNDLE_SRC=../.bridge, PACKAGING=.bridge-packaging,
    .bridge-packaging/ contains build-appimage.sh

Skeleton's `make quality` still green; staging-symfony works locally
(vendor/php-qml/bridge resolves to a real directory, not a symlink).

Closes the v0.1.1 follow-up "bin/php-qml-init parity" tracked in
PLAN.md §13.

Bundled drive-by: docs/makers.md picked up two markdownlint auto-fixes
(blank lines around lists) when the IDE saved.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

bin/php-qml-init

@@ -146,11 +146,31 @@ sed -i \
     -e "s|php-qml — skeleton|php-qml — $NAME|g" \
     "$TARGET/qml/Main.qml"
 
-# Makefile: $(BUILD_DIR)/skeleton → $(BUILD_DIR)/$NAME.
+# Makefile: rewrite identifiers for the appimage target — binary name,
+# packaging filenames, AppImage output filename. The path-repo + packaging
+# absolute paths are handled later (after we know vendor vs absolute mode).
 sed -i \
     -e "s|\$(BUILD_DIR)/skeleton|\$(BUILD_DIR)/$NAME|g" \
+    -e "s|--app-name skeleton|--app-name $NAME|g" \
+    -e "s|packaging/skeleton.desktop|packaging/$NAME.desktop|g" \
+    -e "s|packaging/skeleton.png|packaging/$NAME.png|g" \
+    -e "s|build/Skeleton-x86_64.AppImage|build/$PASCAL-x86_64.AppImage|g" \
     "$TARGET/Makefile"
 
+# Rename packaging files to match the app name + rewrite the Exec/Icon
+# fields in the .desktop file (XDG-launched binary lookup uses these).
+if [ -f "$TARGET/packaging/skeleton.desktop" ]; then
+    mv "$TARGET/packaging/skeleton.desktop" "$TARGET/packaging/$NAME.desktop"
+    sed -i \
+        -e "s|^Name=php-qml Skeleton|Name=php-qml $PASCAL|" \
+        -e "s|^Exec=skeleton|Exec=$NAME|" \
+        -e "s|^Icon=skeleton|Icon=$NAME|" \
+        "$TARGET/packaging/$NAME.desktop"
+fi
+if [ -f "$TARGET/packaging/skeleton.png" ]; then
+    mv "$TARGET/packaging/skeleton.png" "$TARGET/packaging/$NAME.png"
+fi
+
 # .vscode/launch.json: binary path + config label both mention `skeleton`.
 if [ -f "$TARGET/.vscode/launch.json" ]; then
     sed -i \
@@ -168,6 +188,8 @@ if [ "$VENDOR" -eq 1 ]; then
     mkdir -p "$TARGET/.bridge"
     say "vendoring framework/qml → $NAME/.bridge-qml/"
     mkdir -p "$TARGET/.bridge-qml"
+    say "vendoring framework/packaging → $NAME/.bridge-packaging/"
+    mkdir -p "$TARGET/.bridge-packaging"
     if command -v rsync >/dev/null 2>&1; then
         rsync -a --delete \
             --exclude 'vendor/' --exclude '.phpunit.cache/' \
@@ -176,18 +198,23 @@ if [ "$VENDOR" -eq 1 ]; then
         rsync -a --delete \
             --exclude 'build/' \
             "$FRAMEWORK/framework/qml/" "$TARGET/.bridge-qml/"
+        rsync -a --delete \
+            "$FRAMEWORK/packaging/linux/" "$TARGET/.bridge-packaging/"
     else
         cp -R "$FRAMEWORK/framework/php/." "$TARGET/.bridge/"
         cp -R "$FRAMEWORK/framework/qml/." "$TARGET/.bridge-qml/"
+        cp -R "$FRAMEWORK/packaging/linux/." "$TARGET/.bridge-packaging/"
         rm -rf "$TARGET/.bridge/vendor" "$TARGET/.bridge-qml/build" 2>/dev/null || true
     fi
     BUNDLE_URL="../.bridge"
     # qml/CMakeLists.txt lives at $TARGET/qml/, vendored qml module at
     # $TARGET/.bridge-qml/, so the relative path from the consumer is ../.bridge-qml.
     QML_FW_PATH="\${CMAKE_CURRENT_SOURCE_DIR}/../.bridge-qml"
+    PACKAGING_PATH=".bridge-packaging"
 else
     BUNDLE_URL="$FRAMEWORK/framework/php"
     QML_FW_PATH="$FRAMEWORK/framework/qml"
+    PACKAGING_PATH="$FRAMEWORK/packaging/linux"
 fi
 say "path-repo → $BUNDLE_URL"
 # Replace the original "../../php" path-repo URL. The skeleton's
@@ -206,6 +233,15 @@ sed -i \
     -e "s|\${CMAKE_CURRENT_SOURCE_DIR}/../../qml|$QML_FW_PATH|g" \
     "$TARGET/qml/CMakeLists.txt"
 
+# Makefile: BUNDLE_SRC + PACKAGING were framework-tree relative; rewrite
+# to absolute (or the vendored path). Both are matched against the literal
+# values in the skeleton Makefile.
+say "appimage paths → bundle=$BUNDLE_URL packaging=$PACKAGING_PATH"
+sed -i \
+    -e "s|^BUNDLE_SRC   := ../../php\$|BUNDLE_SRC   := $BUNDLE_URL|" \
+    -e "s|^PACKAGING    := ../../packaging/linux\$|PACKAGING    := $PACKAGING_PATH|" \
+    "$TARGET/Makefile"
+
 # ── Composer install + first-run migrations ──────────────────────────
 if [ "$SKIP_INSTALL" -eq 1 ]; then
     say "skipping composer install (--skip-install)"