Phase 1 sub-commit 6: skeleton wiring — make dev runs end-to-end

Symfony app under framework/skeleton/symfony/: minimal bin/console,
public/index.php, MicroKernel-based src/Kernel.php, services.yaml,
framework/security/mercure config, and a demo App\Controller\PingController
that GETs /api/ping (returning JSON pong) and republishes the same
payload to the Mercure topic app://ping. composer.json uses a path
repository to symlink the bundle from ../../php so local edits are
picked up live.

QML app under framework/skeleton/qml/: top-level CMake that
add_subdirectory's framework/qml, a main.cpp that creates the Qt
process, runs SingleInstance.acquireOrForward before any QML loads,
exposes SingleInstance via context property, and loadFromModule's
Skeleton.Main. Main.qml uses BackendConnection / RestClient /
MercureClient from PhpQml.Bridge and renders status dots, a Ping
button, and an event log.

Caddyfile binds 127.0.0.1:8765, enables in-memory Mercure with a
256-bit dev JWT (matches symfony/.env, lcobucci/jwt requires this).
Makefile wraps build / dev / doctor / clean; scripts/dev.sh starts
FrankenPHP --watch and the Qt host together with explicit PID-based
teardown (process-group `kill 0` proved unreliable when frankenphp's
watch fork reparented).

Bug fixes uncovered in this sub-commit:
- SingleInstance.acquireOrForward: probe-first, then removeServer +
  retry-listen. The original loop-with-removeServer-after-failed-bind
  silently exited on stale sockets from prior runs.
- Main.qml: MercureClient does NOT inherit BackendConnection.token —
  Mercure subscribes anonymously in dev (Caddyfile), and forwarding
  the bridge bearer made it 401-loop.
- /api/ping was 500ing because the dev MERCURE_JWT_SECRET was 144 bits;
  bumped to 64-char (>=256 bit) to satisfy lcobucci/jwt.
- Linked the framework lib (php_qml_bridge) explicitly in addition to
  the QML plugin so SingleInstance.h resolves.
- Auto-generated config/reference.php gitignored.

Smoke verified offscreen: /healthz 200, /api/ping 200, 1 publish, 1
subscriber, zero 401s, clean shutdown with no zombies.

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

framework/skeleton/symfony/config/bundles.php

@@ -0,0 +1,8 @@
+<?php
+
+return [
+    Symfony\Bundle\FrameworkBundle\FrameworkBundle::class => ['all' => true],
+    Symfony\Bundle\SecurityBundle\SecurityBundle::class => ['all' => true],
+    Symfony\Bundle\MercureBundle\MercureBundle::class => ['all' => true],
+    PhpQml\Bridge\BridgeBundle::class => ['all' => true],
+];

framework/skeleton/symfony/config/packages/framework.yaml

@@ -0,0 +1,9 @@
+framework:
+    secret: '%env(APP_SECRET)%'
+    http_method_override: false
+    handle_all_throwables: true
+    php_errors:
+        log: true
+    router:
+        utf8: true
+    test: false

framework/skeleton/symfony/config/packages/mercure.yaml

@@ -0,0 +1,9 @@
+mercure:
+    hubs:
+        default:
+            url: '%env(MERCURE_URL)%'
+            public_url: '%env(MERCURE_PUBLIC_URL)%'
+            jwt:
+                secret: '%env(MERCURE_JWT_SECRET)%'
+                publish: ['*']
+                subscribe: ['*']

framework/skeleton/symfony/config/packages/security.yaml

@@ -0,0 +1,18 @@
+security:
+    providers:
+        bridge_provider:
+            memory:
+                users:
+                    bridge: { roles: ['ROLE_BRIDGE'] }
+    firewalls:
+        unauth:
+            pattern: ^/(healthz|\.well-known/mercure)
+            security: false
+        api:
+            pattern: ^/api
+            stateless: true
+            provider: bridge_provider
+            custom_authenticators:
+                - PhpQml\Bridge\SessionAuthenticator
+    access_control:
+        - { path: ^/api, roles: ROLE_BRIDGE }

framework/skeleton/symfony/config/routes.yaml

@@ -0,0 +1,11 @@
+php_qml_bridge:
+    resource:
+        path: ../vendor/php-qml/bridge/src/Controller/
+        namespace: PhpQml\Bridge\Controller
+    type: attribute
+
+app_controllers:
+    resource:
+        path: ../src/Controller/
+        namespace: App\Controller
+    type: attribute

framework/skeleton/symfony/config/services.yaml

@@ -0,0 +1,11 @@
+parameters:
+
+services:
+    _defaults:
+        autowire: true
+        autoconfigure: true
+
+    App\:
+        resource: '../src/'
+        exclude:
+            - '../src/Kernel.php'