Release 1.1.2 — the default path works end to end

Fix release for 1.1.1: the minimal path end to end, engine commands that
run on Godot, Unity and Unreal, hook warnings you can see, and verdicts
that say when they could not check. Details in CHANGELOG.md; upgrade
steps in UPGRADING.md (v1.1.1 → v1.1.2).

Fixes #67
Fixes #131

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01WuJn2FdynEybfL5KC697nJ

.claude/skills/gate-check/references/gate-pre-production.md

@@ -12,7 +12,7 @@
 - [ ] At least 3 Architecture Decision Records in `docs/architecture/` covering
       Foundation-layer systems (scene management, event architecture, save/load)
 - [ ] Engine reference docs exist in `docs/engine-reference/[engine]/`
-- [ ] Test framework initialized: `tests/unit/` and `tests/integration/` directories exist
+- [ ] Test framework initialized: the engine's test root exists — `tests/unit/` and `tests/integration/` (Godot), `Assets/Tests/EditMode/` and `Assets/Tests/PlayMode/` (Unity), or `Source/<Module>/Private/Tests/` (Unreal); see `.claude/docs/directory-structure.md`
 - [ ] CI/CD test workflow exists at `.github/workflows/tests.yml` (or equivalent)
 - [ ] At least one example test file exists to confirm the framework is functional
 - [ ] Master architecture document exists at `docs/architecture/architecture.md`