feat(ui): turn Artifacts V1 on for every instance and hide its toggle (#19164)

## Thinking Path

> - Paperclip is the open source app people use to manage AI agents for
work
> - Artifacts show the output of agent work on the Artifacts page, in
the panel Artifacts tab, and in the task thread
> - #17228 added the Artifacts V1 presentation behind an experimental
setting that is off by default
> - The presentation is now ready for all users, so an opt-in toggle is
no longer necessary
> - A new default alone does not reach all instances, because each
experimental write persists every flag
> - This pull request removes the toggle and turns V1 on for every
instance
> - The benefit is one artifact presentation for all users, with an off
switch for hosting operators

## Linked Issues or Issue Description

Refs #17228
Refs #17263

**Is your feature request related to a problem? Please describe.**
Artifacts V1 shows only on instances where an admin turned on an
experimental setting. Other users see the previous cards.

**Describe the solution you would like**
Show Artifacts V1 on all instances. Remove the toggle from Experimental
settings.

**Describe alternatives you have considered**
A new default without a change to the hook. This does not work, because
many instances have a stored false that nobody chose, and no toggle
would remain to change it.

## What Changed

- Removed the Artifacts V1 card from Instance Settings, Experimental.
- Changed `enableArtifactsV1` to default on in the schema, the feature
catalog, and the settings service.
- Changed `resolveArtifactsV1Enabled` to ignore a stored false. It
honours false only when the value comes from managed config.
- Kept the flag and the previous cards, so a hosting operator can hold
V1 off.
- Kept the key in the Cloud staging list, so a managed false does not
hold V1 off on staging.
- Updated unit tests, the Artifacts V1 plan, and the directions-lab
Today reference.
- Moved the attachment and upload e2e specs and the runner download
helper to the V1 rows.
- Added V1 tests for a Markdown review: expansion, deep link, and open,
raw and download actions.

## Verification

- `cd ui && npx vitest run`: one test file failed before its fix. That
file tests the previous cards, and it now mocks the hook to off. I reran
it with the other changed UI tests, and they pass. I did not repeat the
full UI run after the fix.
- `npx playwright test --config tests/e2e/playwright.config.ts
tests/e2e/text-attachment-tabs.spec.ts
tests/e2e/artifact-uploads.spec.ts
tests/e2e/artifact-tab-arrival.spec.ts`: 10 tests pass on V1.
- `tests/e2e/cloud-auth.spec.ts` failed once in CI on a task heading. It
does not touch artifacts, and 10 local runs pass.
- `cd server && npx vitest run src/__tests__/instance-settings`: 183
tests pass.
- `cd packages/shared && npx vitest run src/feature-catalog.test.ts
src/validators/instance.test.ts`: 35 tests pass.
- `pnpm run check:token-gates` and the `ui` and `server` typechecks
pass. I did not run the full repository check.
- In the artifact directions lab, with no stored settings, the Today
right panel renders the V1 rows.
- I did not test this on a live instance. After merge, confirm on
staging that the Experimental page has no Artifacts V1 card and that all
three surfaces show V1.

## Risks

- All users see V1 after the next release, not only staging users. To
revert, revert this pull request.
- Users cannot turn V1 off. Only a hosting operator can, through managed
config, and not on Cloud staging.
- An instance with a managed `enableArtifactsV1: false` stays on the
previous cards. The cloud harness source has no reference to this key,
but I cannot read the live fleet configuration.
- V1 surfaces render before settings load. An operator-held instance can
briefly show V1 before the previous cards.
- Admins who use the API can still write the flag. The write has no
effect on unmanaged instances.

> For core feature work, check [`ROADMAP.md`](ROADMAP.md) first and
discuss it in `#dev` before opening the PR. Feature PRs that overlap
with planned core work may need to be redirected — check the roadmap
first. See `CONTRIBUTING.md`.

## Model Used

- Anthropic Claude Opus 5.5 (`claude-opus-5-5`) in Claude Code, with
tool use and code execution.

## Checklist

- [x] I have included a thinking path that traces from project context
to this change
- [x] I have specified the model used (with version and capability
details)
- [x] I have checked ROADMAP.md and confirmed this PR does not duplicate
planned core work
- [x] I have searched GitHub for duplicate or related PRs and linked
them above
- [x] I have either (a) linked existing issues with `Fixes: #` / `Closes
#` / `Refs #` OR (b) described the issue in-PR following the relevant
issue template
- [x] I have not referenced internal/instance-local Paperclip issues or
links (only public GitHub `#NNN` / `github.com/paperclipai/paperclip`
URLs)
- [x] My branch name describes the change (e.g. `docs/...`, `fix/...`)
and contains no internal Paperclip ticket id or instance-derived details
- [x] I have run tests locally and they pass
- [x] I have added or updated tests where applicable
- [x] I have updated relevant documentation to reflect my changes
- [x] I have considered and documented any risks above
- [ ] All Paperclip CI gates are green
- [ ] Greptile is 5/5 with no open P2s, recommendations, or follow-ups
- [x] I will address all Greptile and reviewer comments before
requesting merge

🤖 Generated with [Claude Code](https://claude.com/claude-code)

---------

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

ui/src/components/issue-properties/IssuePropertiesArtifactsTab.v1.test.tsx

@@ -6,6 +6,7 @@ import { createRoot, type Root } from "react-dom/client";
 import { QueryClient, QueryClientProvider } from "@tanstack/react-query";
 import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
 import type { Issue, IssueAttachment, IssueDocument, IssueWorkProduct } from "@paperclipai/shared";
+import { TextAttachmentContext } from "@/context/TextAttachmentContext";
 import { IssuePropertiesArtifactsTab, TaskGeneralDocuments, type TaskDocumentEditorOptions } from "./IssuePropertiesArtifactsTab";
 
 (globalThis as { IS_REACT_ACT_ENVIRONMENT?: boolean }).IS_REACT_ACT_ENVIRONMENT = true;
@@ -177,12 +178,14 @@ describe("IssuePropertiesArtifactsTab with Artifacts V1 on", () => {
     vi.clearAllMocks();
   });
 
-  function render(props: { onOpenDocument?: (document: IssueDocument) => void; documentEditor?: TaskDocumentEditorOptions } = {}) {
+  function render(props: { onOpenDocument?: (document: IssueDocument) => void; documentEditor?: TaskDocumentEditorOptions; documentDeepLink?: { requestId: number; documentKey: string } } = {}, openText?: (attachmentId: string, name: string) => void) {
     const queryClient = new QueryClient({ defaultOptions: { queries: { retry: false }, mutations: { retry: false } } });
     flushSync(() => {
       root.render(
         <QueryClientProvider client={queryClient}>
-          <IssuePropertiesArtifactsTab issue={issue} documentEditor={editorOptions} {...props} />
+          <TextAttachmentContext.Provider value={openText ?? null}>
+            <IssuePropertiesArtifactsTab issue={issue} documentEditor={editorOptions} {...props} />
+          </TextAttachmentContext.Provider>
         </QueryClientProvider>,
       );
     });
@@ -299,6 +302,55 @@ describe("IssuePropertiesArtifactsTab with Artifacts V1 on", () => {
     expect(service?.textContent).not.toContain("Running");
   });
 
+  describe("a Markdown work product", () => {
+    const contentPath = `/api/attachments/${ATTACHMENT_ID}/content`;
+    const reviewKey = "artifact-review-wp-report";
+    const markdownWorkProduct = {
+      ...pdfWorkProduct,
+      id: "wp-report",
+      title: "Verification report",
+      metadata: { attachmentId: ATTACHMENT_ID, contentType: "text/markdown", byteSize: 64, contentPath, openPath: contentPath, downloadPath: `${contentPath}?download=1`, originalFilename: "report.md" },
+    };
+    const reviewDocument = { ...planDocument, id: "doc-review", key: reviewKey, title: "Verification report", body: "Rendered review body" };
+    const reviewRow = () => container.querySelector<HTMLButtonElement>('button[aria-label="Open report.md"]');
+
+    beforeEach(() => {
+      mockIssuesApi.listAttachments.mockResolvedValue([]);
+      mockIssuesApi.listWorkProducts.mockResolvedValue([markdownWorkProduct]);
+      mockUseIssueDocuments.mockReturnValue({ data: [reviewDocument] });
+    });
+
+    it("expands its review in place from the row", async () => {
+      render();
+      await waitFor(() => expect(reviewRow()).not.toBeNull());
+      expect(reviewRow()!.getAttribute("aria-expanded")).toBe("false");
+      expect(container.textContent).not.toContain("Rendered review body");
+      act(() => reviewRow()!.click());
+      expect(reviewRow()!.getAttribute("aria-expanded")).toBe("true");
+      await waitFor(() => expect(container.textContent).toContain("Rendered review body"));
+      expect(mockIssuesApi.ensureWorkProductReviewDocument).not.toHaveBeenCalled();
+    });
+
+    it("opens its review from a deep link", async () => {
+      render({ documentDeepLink: { requestId: 1, documentKey: reviewKey } });
+      await waitFor(() => expect(container.textContent).toContain("Rendered review body"));
+      expect(reviewRow()!.getAttribute("aria-expanded")).toBe("true");
+    });
+
+    it("keeps its open, raw and download actions beside the row", async () => {
+      const openText = vi.fn();
+      render({}, openText);
+      await waitFor(() => expect(reviewRow()).not.toBeNull());
+      const raw = container.querySelector<HTMLAnchorElement>('a[aria-label="Open raw Verification report"]');
+      expect(raw?.getAttribute("href")).toBe(contentPath);
+      expect(raw?.getAttribute("target")).toBe("_blank");
+      expect(container.querySelector('a[aria-label="Download Verification report"]')?.getAttribute("href")).toBe(`${contentPath}?download=1`);
+      act(() => container.querySelector<HTMLButtonElement>('button[aria-label="Open in tab: Verification report"]')!.click());
+      expect(openText).toHaveBeenCalledWith(ATTACHMENT_ID, "report.md");
+      expect(reviewRow()!.getAttribute("aria-expanded")).toBe("false");
+    });
+  });
+
   it("opens a task document the way the panel asks, through onOpenDocument", async () => {
     const onOpenDocument = vi.fn();
     render({ onOpenDocument });

ui/src/components/issue-properties/IssuePropertiesMarkdownWorkProduct.test.tsx

@@ -26,6 +26,7 @@ const mockUseIssueDocuments = vi.hoisted(() =>
   vi.fn((): { data: IssueDocument[] } => ({ data: [] })),
 );
 vi.mock("@/hooks/useIssueDocuments", () => ({ useIssueDocuments: mockUseIssueDocuments }));
+vi.mock("@/hooks/useArtifactsV1Enabled", () => ({ useArtifactsV1Enabled: () => ({ enabled: false, loaded: true }) }));
 vi.mock("@/lib/router", () => ({
   Link: ({ to, children, ...props }: { to: string; children: React.ReactNode }) => <a href={to} {...props}>{children}</a>,
   useLocation: () => ({ hash: "" }),