chore: v2.8.15 — Oh My Pi login sharing, omp --allow-home, Markdown Preview default, first-login password

- omp-share.js: an admin's switch (S3) runs omp's own auth broker + gateway as
  the host on loopback; a member's omp pane reaches it as a scoped client keyed
  by its pane token (clients file = live omp panes only), runs on
  --model agenthub/<model>, never holds a credential.
- omp catalog: --allow-home, so a workspace at the account's home keeps its
  sessions there (they were recorded under a temp dir and dropped).
- Settings → Appearance → Open Markdown as: Preview (default) or Raw, for
  Files/Changes, the config viewer and a chat's file panel.
- First-login password change and password rules, avatar URLs, Artifacts
  "Mine" includes installed shared skills/plugins, a member's own hook pages.

client/src/components/lanes/__tests__/LaneChangesPanel.test.tsx

@@ -514,7 +514,7 @@ describe("LaneChangesPanel", () => {
     expect(screen.getByText("Unversioned Files")).toBeInTheDocument();
   });
 
-  it("reads a whole markdown file rendered after Preview, and back as source after Raw", async () => {
+  it("opens a whole markdown file rendered, as source after Raw, and rendered again after Preview", async () => {
     vi.mocked(api.lanes.gitTree).mockResolvedValue({
       available: true,
       path: "",
@@ -534,12 +534,13 @@ describe("LaneChangesPanel", () => {
     render(<LaneChangesPanel laneId={7} full />);
     const sidebar = await screen.findByTestId("lane-changes-sidebar");
     await user.click(await within(sidebar).findByText("README.md"));
-    await screen.findByTestId("lane-file-editor");
-    await user.click(screen.getByTestId("lane-file-preview"));
-    expect(screen.getByRole("heading", { name: "Hello" })).toBeInTheDocument();
+    expect(await screen.findByRole("heading", { name: "Hello" })).toBeInTheDocument();
     expect(screen.queryByTestId("lane-file-editor")).toBeNull();
     await user.click(screen.getByTestId("lane-file-preview"));
     expect(await screen.findByTestId("lane-file-editor")).toHaveValue("# Hello\n\n- one");
+    await user.click(screen.getByTestId("lane-file-preview"));
+    expect(screen.getByRole("heading", { name: "Hello" })).toBeInTheDocument();
+    expect(screen.queryByTestId("lane-file-editor")).toBeNull();
   });
 
   it("shows an image file as the picture, with no edit control", async () => {