Phase 3 sub-commit 3: examples/todo POC app, built via the makers

Standalone Composer/CMake project under examples/todo/ derived from the
skeleton, demonstrating every Phase 3 architectural primitive in a
non-trivial app. All cross-side wiring is maker-generated; no
handwritten bridge glue.

Generated and customised:

  - src/Entity/Todo.php — make:bridge:resource Todo (UUIDv7 id)
  - src/Controller/TodoController.php — make:bridge:resource Todo (CRUD)
  - src/Controller/MarkAllDoneController.php — make:bridge:command
    MarkAllDone, body filled in to flip done=true on every row
  - qml/TodoList.qml — make:bridge:resource Todo (starter ListView)
  - qml/TodoWindow.qml — make:bridge:window Todo, body customised to
    embed a read-only mirror of the same ReactiveListModel

The Phase 1 ping demo is dropped from this app — it doesn't fit the
todo flow and nothing in Main.qml references it.

Main.qml is the real list UI:

  - Add input + button (POST /api/todos with optimistic-friendly key).
  - Per-row CheckBox + delete button (PATCH/DELETE via
    todoModel.invoke() with `pending` role driving opacity).
  - "Mark all done" button (POST /api/mark-all-done).
  - "Open second window" button (Component { TodoWindow {} } pattern).

Build / run delegated to the same Makefile shape as the skeleton, with
SCRIPT_DIR/QT_BIN updated for the renamed binary (build/qml/todo).
composer.json's path repo points at ../../../framework/php (one level
deeper than the skeleton's path repo).

Verified end-to-end with offscreen QPA: POST/PATCH/DELETE on /api/todos
all round-trip, /api/mark-all-done flips every row, Mercure dual-
publishes on every change. Clean shutdown.

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

examples/todo/Makefile

@@ -0,0 +1,42 @@
+# php-qml — Todo example app — Make targets.
+
+.DEFAULT_GOAL := help
+
+SYMFONY_DIR  := symfony
+QML_SRC_DIR  := qml
+BUILD_DIR    := build/qml
+QT_BIN       := $(BUILD_DIR)/todo
+
+.PHONY: help
+help: ## Show available targets
+	@awk 'BEGIN {FS = ":.*?## "} /^[a-zA-Z_-]+:.*?## / {printf "  %-12s %s\n", $$1, $$2}' $(MAKEFILE_LIST)
+
+.PHONY: install
+install: ## Install Composer dependencies for the Symfony app
+	cd $(SYMFONY_DIR) && composer install
+
+.PHONY: build
+build: ## Build the Qt host
+	cmake -S $(QML_SRC_DIR) -B $(BUILD_DIR) -DCMAKE_BUILD_TYPE=Debug
+	cmake --build $(BUILD_DIR) --parallel
+
+.PHONY: dev
+dev: build ## Run the todo app in dev mode (FrankenPHP --watch + Qt host)
+	./scripts/dev.sh
+
+.PHONY: doctor
+doctor: ## Run bridge:doctor inside the Symfony app
+	cd $(SYMFONY_DIR) && bin/console bridge:doctor
+
+.PHONY: doctor-connect
+doctor-connect: ## Run bridge:doctor with backend connectivity probe
+	cd $(SYMFONY_DIR) && bin/console bridge:doctor --connect
+
+.PHONY: clean
+clean: ## Remove build artefacts
+	rm -rf $(BUILD_DIR)
+
+.PHONY: quality
+quality: build ## Run PHPStan, php-cs-fixer (check), PHPUnit, qmllint
+	cd ../php && composer quality
+	cmake --build $(BUILD_DIR) --target all_qmllint