lib-core.git-test v0.1.0: smoke test for the libgit2 wrapper

Exercises the sync API (clone, is_repo, describe, tags) against a
public Gitea repo over HTTPS, plus the async ls_remote_tags handshake
through the engine async-pool. Designed for SPOREL_CI runs: kicks off
the async work in init(), polls in update(), calls engine.exit(0)
once the result has been taken.

manifest.module

@@ -0,0 +1,11 @@
+{
+  "id": "lib-core.git-test",
+  "version": "0.1.0",
+  "kind": "module",
+  "api": "^0.1",
+  "ci_frames": 1800,
+  "entry_point": "init.lua",
+  "deps": [
+    {"id": "lib-core.git", "version": "0.1.0"}
+  ]
+}