diff --git a/src/lib/github-auth.ts b/src/lib/github-auth.ts
index 23d7921..2810e51 100644
--- a/src/lib/github-auth.ts
+++ b/src/lib/github-auth.ts
@@ -1,2 +1,13 @@
-/** GitHub authentication and pagination exports. */
-export * from "./github";
+/**
+ * GitHub authentication and pagination facade — intentionally empty.
+ *
+ * This facade was introduced as part of #618 (split `github.ts` into domain
+ * modules) but was closed as declined by #655. The facades added no value
+ * beyond re-exporting from `./github`, so they have been left as empty
+ * modules to preserve the public module surface and the file's role as a
+ * documented split point, without the misleading `export *` re-export.
+ *
+ * Callers should import directly from `@/lib/github`. See #655 for the
+ * reconciliation decision.
+ */
+export {};
diff --git a/src/lib/github-ci.ts b/src/lib/github-ci.ts
index 8217a68..7c01a0f 100644
--- a/src/lib/github-ci.ts
+++ b/src/lib/github-ci.ts
@@ -1,2 +1,14 @@
-/** GitHub Actions and CI exports. */
-export * from "./github";
+/**
+ * GitHub CI (workflows, runs, jobs, releases, packages, metadata) facade —
+ * intentionally empty.
+ *
+ * This facade was introduced as part of #618 (split `github.ts` into domain
+ * modules) but was closed as declined by #655. The facades added no value
+ * beyond re-exporting from `./github`, so they have been left as empty
+ * modules to preserve the public module surface and the file's role as a
+ * documented split point, without the misleading `export *` re-export.
+ *
+ * Callers should import directly from `@/lib/github`. See #655 for the
+ * reconciliation decision.
+ */
+export {};
diff --git a/src/lib/github-code-search.ts b/src/lib/github-code-search.ts
index 9661266..3be61df 100644
--- a/src/lib/github-code-search.ts
+++ b/src/lib/github-code-search.ts
@@ -1,2 +1,14 @@
-/** GitHub code-search exports. */
-export * from "./github";
+/**
+ * GitHub code search and discussion / membership helpers facade — intentionally
+ * empty.
+ *
+ * This facade was introduced as part of #618 (split `github.ts` into domain
+ * modules) but was closed as declined by #655. The facades added no value
+ * beyond re-exporting from `./github`, so they have been left as empty
+ * modules to preserve the public module surface and the file's role as a
+ * documented split point, without the misleading `export *` re-export.
+ *
+ * Callers should import directly from `@/lib/github`. See #655 for the
+ * reconciliation decision.
+ */
+export {};
diff --git a/src/lib/github-facades.test.ts b/src/lib/github-facades.test.ts
new file mode 100644
index 0000000..767d198
--- /dev/null
+++ b/src/lib/github-facades.test.ts
@@ -0,0 +1,22 @@
+// @vitest-environment node
+// Regression test for #655: the four domain facades introduced by #618 must
+// remain intentionally empty and must not re-export from `./github`. See
+// #655 for the reconciliation decision.
+import { describe, expect, it } from "vitest";
+import * as Auth from "./github-auth";
+import * as Ci from "./github-ci";
+import * as CodeSearch from "./github-code-search";
+import * as Issues from "./github-issues";
+
+describe("github domain facades (regression for #655)", () => {
+  const facades = [
+    ["github-auth", Auth],
+    ["github-ci", Ci],
+    ["github-code-search", CodeSearch],
+    ["github-issues", Issues],
+  ] as const;
+
+  it.each(facades)("%s has no named exports", (_name, mod) => {
+    expect(Object.keys(mod).sort()).toEqual([]);
+  });
+});
diff --git a/src/lib/github-issues.ts b/src/lib/github-issues.ts
index c7ee51b..6d5150e 100644
--- a/src/lib/github-issues.ts
+++ b/src/lib/github-issues.ts
@@ -1,2 +1,13 @@
-/** GitHub issue and pull-request exports. */
-export * from "./github";
+/**
+ * GitHub issues, pull requests and review helpers facade — intentionally empty.
+ *
+ * This facade was introduced as part of #618 (split `github.ts` into domain
+ * modules) but was closed as declined by #655. The facades added no value
+ * beyond re-exporting from `./github`, so they have been left as empty
+ * modules to preserve the public module surface and the file's role as a
+ * documented split point, without the misleading `export *` re-export.
+ *
+ * Callers should import directly from `@/lib/github`. See #655 for the
+ * reconciliation decision.
+ */
+export {};
diff --git a/src/lib/github.ts b/src/lib/github.ts
index 35e94aa..c78c3d7 100644
--- a/src/lib/github.ts
+++ b/src/lib/github.ts
@@ -1,3 +1,14 @@
+/**
+ * GitHub REST + GraphQL client wrapper.
+ *
+ * Size note: this file is intentionally kept as a single ~1000-line module
+ * rather than split by domain (auth / issues / CI / code-search). The split
+ * proposed in #618 was closed as declined by #655 after review showed the
+ * domain facades added no value beyond `export * from "./github"`. See the
+ * sibling facade files (`./github-auth`, `./github-ci`,
+ * `./github-code-search`, `./github-issues`) for the documented split points
+ * and #655 for the reconciliation decision.
+ */
 import { GitHubIssue } from "@/types";
 import type { CheckFailure, PrHealthInput } from "./linked-pr-health";