v0.2.0 (13/N): qmltestrunner harness + CI wiring + close out v0.2.0 plan

Closes the testing-strategy row of PLAN.md §13 v0.2.0 and parks the
two remaining items with rationales.

Shipped:

- framework/qml/tests/{CMakeLists.txt, main.cpp, tst_smoke.qml}
  Qt Quick Test scaffold: QUICK_TEST_MAIN bootstrap + one smoke test
  proving the harness loads. New tests land as tst_<feature>.qml in
  the same dir; qmltestrunner auto-discovers them. Built only when
  -DBUILD_TESTING=ON (production AppImages stay clean).
- skeleton + example/todo Makefiles: `make qmltest` target invokes
  the configure → build → ctest dance. `make quality` now depends
  on qmltest.
- .gitea/workflows/ci.yml: `QML unit tests` step after qmllint in
  the Quality job. Out-of-tree build dir (build-tests) so the
  CTest run doesn't pollute the cached release build.

Verified locally: configure + build + ctest pass, both smoke
assertions pass, runs in 0.5s.

Closed in PLAN.md §13 v0.2.0 with rationale (no code change):

- Build-time Symfony cache warmup → moved to v0.3.0. The obvious
  approach (cache:warmup at build, copy at first launch) doesn't
  save any time because Symfony bakes absolute kernel.project_dir
  into the compiled cache, and the AppImage's FUSE mount path
  changes every launch — every cached path is stale on launch N+1.
  Doing it properly requires virtualising getProjectDir(), symlink
  fix-up, multi-app namespacing — its own minor's worth of design.
- ReactiveObject cursor pagination → closed N/A. ReactiveObject
  already has pending / invoke() / Idempotency-Key correlation /
  version-gap detection at parity with ReactiveListModel; the only
  feature it lacks is *pagination*, which is meaningless for a
  single-entity model.

That fully closes the v0.2.0 plan as documented. Remaining v0.2.0
items in PLAN.md §13 are the audit-ends already shipped earlier in
the cycle (interfaces / BridgeOp / BridgeBundleInfo / Maker DRY /
--with-dto / port negotiation / pre-migration backup / bridge:export
/ periodic auto-update / native-dialogs doc / event maker /
read-model maker / qmltestrunner) plus the two parked items
documented above. Ready to tag when the user gives the word.

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

framework/qml/tests/tst_smoke.qml

@@ -0,0 +1,25 @@
+// Smoke test — proves the qmltestrunner harness is wired up. Doesn't
+// touch BackendConnection (which would require a live FrankenPHP child)
+// or any other framework-side code that needs network/state. The
+// assertion is intentionally trivial; the *infrastructure* is what's
+// being tested at this layer.
+//
+// Add domain-meaningful tests as `tst_<feature>.qml` next to this file
+// — qmltestrunner auto-discovers any `tst_*.qml` and runs every
+// `TestCase` function whose name starts with `test_`.
+
+import QtQuick
+import QtTest
+
+TestCase {
+    name: "Smoke"
+
+    function test_qml_engine_alive() {
+        compare(2 + 2, 4, "QtTest harness is loaded and arithmetic still works")
+    }
+
+    function test_string_template() {
+        const x = 7
+        compare(`x is ${x}`, "x is 7", "QML template literals available")
+    }
+}