docs: publish Tend Compose continuity evidence

Export the reviewed allowlisted snapshot from private source commit 07c1655921f21ee5e4fc4d85639d199e8867b17d. This records the Docker Compose activation, schema-compatible rollback, and stateful migration resource findings from Observatory Preview 19 dogfooding.

AI-Assisted: OpenAI Codex
Signed-off-by: Cole Speelman <crspeelman@gmail.com>

internal/version/version_test.go

@@ -0,0 +1,33 @@
+// SPDX-License-Identifier: AGPL-3.0-only
+
+package version
+
+import "testing"
+
+func TestSelectVersion(t *testing.T) {
+	t.Parallel()
+	tests := []struct {
+		name, linker, module, want string
+	}{
+		{"local build", developmentVersion, "(devel)", developmentVersion},
+		{"missing build info", developmentVersion, "", developmentVersion},
+		{"preview one install", developmentVersion, "v0.1.0-preview.1", "v0.1.0-preview.1"},
+		{"preview two install", developmentVersion, "v0.1.0-preview.2", "v0.1.0-preview.2"},
+		{"release install", developmentVersion, "v1.0.0", "v1.0.0"},
+		{"linker override", "v0.1.0-preview.2", "(devel)", "v0.1.0-preview.2"},
+		{"pseudo version", developmentVersion, "v0.0.0-20260814120000-0123456789ab", developmentVersion},
+		{"pseudo after release", developmentVersion, "v0.1.1-0.20260814120000-0123456789ab", developmentVersion},
+		{"build metadata", developmentVersion, "v0.1.0+dirty", developmentVersion},
+		{"leading zero release", developmentVersion, "v00.1.0", developmentVersion},
+		{"leading zero prerelease", developmentVersion, "v0.1.0-preview.02", developmentVersion},
+	}
+	for _, test := range tests {
+		test := test
+		t.Run(test.name, func(t *testing.T) {
+			t.Parallel()
+			if got := selectVersion(test.linker, test.module); got != test.want {
+				t.Fatalf("selectVersion(%q, %q)=%q want %q", test.linker, test.module, got, test.want)
+			}
+		})
+	}
+}