feat(P18): testing + CI/CD pipelines - pytest suite, check-only mode, Gitea + GitHub workflows (v1.3.2)

90 offline tests covering adapter, confidence_signal, checkov_adapter,
outbox_writer, and pipeline integration. Identical CI/CD workflows for
Gitea Actions (dev) and GitHub Actions (production). New --check-only
mode for run_platform.sh (offline, no AWS).

---ci---
project: acdl
phase: 18
milestone: v1.3
status: verify
---/ci---

pyproject.toml

@@ -0,0 +1,31 @@
+[project]
+name = "acdl"
+version = "1.3.0"
+description = "Agentic Cloud Delivery Platform — consumers declare intent; the platform delivers safe production deployment."
+requires-python = ">=3.10"
+dependencies = [
+    "boto3>=1.34",
+    "jsonschema>=4.20",
+    "pyyaml>=6.0",
+]
+
+[project.optional-dependencies]
+test = [
+    "pytest>=8.0",
+    "pytest-cov>=4.0",
+    "moto[dynamodb]>=5.0",
+]
+
+[tool.pytest.ini_options]
+testpaths = ["tests"]
+markers = [
+    "offline: tests that run without AWS/Checkov/DynamoDB",
+]
+addopts = "-v --tb=short"
+
+[tool.coverage]
+run.source = ["acdl_platform", "adapters"]
+
+[build-system]
+requires = ["setuptools>=68"]
+build-backend = "setuptools.backends._legacy:_Backend"