fix: hot reload plugin management changes (#75976)

Summary:
- The PR changes Gateway reload planning, CLI plugin install-index writes, plugin runtime/cache cleanup, docs, changelog, and tests so plugin enable/disable hot reloads while install/update/uninstall stay restart-backed.
- Reproducibility: yes. The earlier blocker has a source-level reproduction: run an external plugin install/up ...  watches config and only the managed plugin index changes; the PR now tests that path and queues a restart.

ClawSweeper fixups:
- Included follow-up commit: fix: hot reload plugin management changes
- Included follow-up commit: fix(clawsweeper): address review for automerge-openclaw-openclaw-7597…
- Ran the ClawSweeper repair loop before final review.

Validation:
- ClawSweeper review passed for head 860594f722.
- Required merge gates passed before the squash merge.

Prepared head SHA: 860594f722
Review: https://github.com/openclaw/openclaw/pull/75976#issuecomment-4363168379

Co-authored-by: Peter Steinberger <steipete@gmail.com>
Co-authored-by: clawsweeper <274271284+clawsweeper[bot]@users.noreply.github.com>

src/cli/plugins-install-record-commit.test.ts

@@ -78,6 +78,7 @@ describe("commitConfigWithPendingPluginInstalls", () => {
       },
       baseHash: "config-1",
       writeOptions: {
+        afterWrite: { mode: "restart", reason: "plugin source changed" },
         unsetPaths: [["plugins", "installs"]],
       },
     });
@@ -97,6 +98,33 @@ describe("commitConfigWithPendingPluginInstalls", () => {
     });
   });
 
+  it("does not add restart intent when pending records match the plugin index", async () => {
+    const existingRecords: Record<string, PluginInstallRecord> = {
+      demo: {
+        source: "npm",
+        spec: "demo@1.0.0",
+      },
+    };
+    mocks.loadInstalledPluginIndexInstallRecords.mockResolvedValue(existingRecords);
+
+    await commitConfigWithPendingPluginInstalls({
+      nextConfig: {
+        plugins: {
+          installs: existingRecords,
+        },
+      },
+      baseHash: "config-1",
+    });
+
+    expect(mocks.replaceConfigFile).toHaveBeenCalledWith({
+      nextConfig: {},
+      baseHash: "config-1",
+      writeOptions: {
+        unsetPaths: [["plugins", "installs"]],
+      },
+    });
+  });
+
   it("rolls back plugin index writes when the config write fails", async () => {
     const existingRecords: Record<string, PluginInstallRecord> = {
       existing: {