feat(scripts): implement report-status.sh with bats and cucumber tests

POST build status to Gitea REST API. Supports pending, success, failure,
error states. Cross-repo reporting via optional root_commit and root_repo
parameters. Includes mock Gitea API server shared between bats unit tests
and cucumber acceptance tests.

package.json

@@ -0,0 +1,24 @@
+{
+  "name": "gitea-ci-library",
+  "version": "1.0.0",
+  "description": "",
+  "main": "cucumber.js",
+  "directories": {
+    "doc": "docs",
+    "test": "tests"
+  },
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "repository": {
+    "type": "git",
+    "url": "ssh://git@gitea.app.keskikuja.site:30009/niko/gitea-ci-library.git"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "type": "commonjs",
+  "devDependencies": {
+    "@cucumber/cucumber": "^13.0.0"
+  }
+}