test: add 106 unit + smoke tests, 93% coverage

- pytest + respx + pytest-cov added as dev dependencies
- tests/smoke/test_registration.py: verify all 66 tools registered and unique
- tests/unit/: 12 files covering every tool — HTTP method, URL, params/body, errors
- tests/config.test.json + conftest.py: zero-network test setup via GITEA_CONFIG
- CLAUDE.md: developer guide with testing philosophy, pyramid, and commands
- server/gitea_mcp.py: get_commit, list_pr_files tools added
- README.md: tool count corrected to 66

tests/unit/test_releases.py

@@ -0,0 +1,79 @@
+import json
+import pytest
+import httpx
+import respx
+from server.gitea_mcp import list_releases, get_latest_release, create_release, delete_release
+
+BASE = "https://gitea.test/api/v1"
+
+
+@respx.mock
+def test_list_releases():
+    route = respx.get(f"{BASE}/repos/owner/repo/releases").mock(
+        return_value=httpx.Response(200, json=[{"id": 1, "tag_name": "v1.0.0"}])
+    )
+    result = list_releases("owner", "repo")
+    assert route.called
+    assert result[0]["tag_name"] == "v1.0.0"
+    assert dict(route.calls[0].request.url.params)["limit"] == "10"
+
+
+@respx.mock
+def test_get_latest_release():
+    route = respx.get(f"{BASE}/repos/owner/repo/releases/latest").mock(
+        return_value=httpx.Response(200, json={"id": 3, "tag_name": "v2.0.0"})
+    )
+    result = get_latest_release("owner", "repo")
+    assert route.called
+    assert result["tag_name"] == "v2.0.0"
+
+
+@respx.mock
+def test_get_latest_release_not_found():
+    respx.get(f"{BASE}/repos/owner/repo/releases/latest").mock(
+        return_value=httpx.Response(404, json={"message": "not found"})
+    )
+    with pytest.raises(RuntimeError, match="404"):
+        get_latest_release("owner", "repo")
+
+
+@respx.mock
+def test_create_release():
+    route = respx.post(f"{BASE}/repos/owner/repo/releases").mock(
+        return_value=httpx.Response(201, json={"id": 5, "tag_name": "v3.0.0"})
+    )
+    result = create_release("owner", "repo", "v3.0.0", "Release 3.0.0")
+    assert route.called
+    body = json.loads(route.calls[0].request.content)
+    assert body["tag_name"] == "v3.0.0"
+    assert body["name"] == "Release 3.0.0"
+    assert body["draft"] is False
+    assert body["prerelease"] is False
+    assert "body" not in body
+
+
+@respx.mock
+def test_create_release_draft_with_notes():
+    route = respx.post(f"{BASE}/repos/owner/repo/releases").mock(
+        return_value=httpx.Response(201, json={"id": 6})
+    )
+    create_release(
+        "owner", "repo", "v4.0.0-beta", "Beta release",
+        body="## Changes\n- new feature", draft=True, prerelease=True,
+        target_commitish="develop",
+    )
+    body = json.loads(route.calls[0].request.content)
+    assert body["body"] == "## Changes\n- new feature"
+    assert body["draft"] is True
+    assert body["prerelease"] is True
+    assert body["target_commitish"] == "develop"
+
+
+@respx.mock
+def test_delete_release():
+    route = respx.delete(f"{BASE}/repos/owner/repo/releases/5").mock(
+        return_value=httpx.Response(204)
+    )
+    result = delete_release("owner", "repo", 5)
+    assert route.called
+    assert result == {"success": True}