test(04-06): Wave 0 — inline-SVG source-contract RED + cursor-visibility regression pin

- tests/welcome/inline-svg.test.ts (NEW; 3 tests, node-env source-contract):
  - Test A: mokosh-mark.svg carries stroke="currentColor" + viewBox="0 0 32 32"
    (currently RED — SVG still has stroke="#181b2a").
  - Test B: welcome.ts uses ?raw import + DOMParser + replaceChildren and
    does NOT use innerHTML (MV3 CSP discipline / T-04-06-01).
    Currently RED — welcome.ts still ?url + <img>.
  - Test C: globals.d.ts declares the *.svg?raw ambient module.
    Currently RED — only *.svg?url + *.webm?url declared.
- tests/build/cursor-visibility.test.ts (NEW; 1 test, node-env file-grep):
  - GREEN-on-arrival regression pin for the cursor: 'always' literal at
    src/offscreen/recorder.ts:285 (shipped opportunistically Plan 01-09).
- Mirrors the canonical tests/i18n/manifest-i18n.test.ts scaffold
  (readFileSync + expect(text).toContain(...)) — vitest is environment:'node'
  and the project ships no DOM-emulation library, so the inline-svg test
  pins source TEXT only; the live-DOM injection + currentColor cascade is
  verified by the host-side harness assertion A35 (Task 3).

tests/build/cursor-visibility.test.ts

@@ -0,0 +1,45 @@
+// tests/build/cursor-visibility.test.ts — Plan 04-06 cursor-visibility
+// defensive regression pin (RESEARCH Finding 4 closure).
+//
+// Pins that src/offscreen/recorder.ts:285 carries the `cursor: 'always'`
+// getDisplayMedia constraint — the original Phase-5 deferral was lifted
+// opportunistically in Plan 01-09 (recorder.ts:285) and the back-patched
+// Plan 04-06 closes the audit loop by both (a) re-verifying the literal
+// via this defensive grep test and (b) flipping the stale "deferred to
+// Phase 5" lines in .planning/phases/01-stabilize-video-pipeline/
+// 01-07-SUMMARY.md (Task 3 of Plan 04-06).
+//
+// Polarity at land: GREEN-on-arrival — the literal already exists at
+// recorder.ts:285 (verified at 04-06 re-plan iter-2; confirmed via
+// `grep -n "cursor: 'always'" src/offscreen/recorder.ts`).
+//
+// SCOPE: node-env file-grep regression pin. Does NOT instantiate the
+// MediaStream pipeline (out of scope for unit tests; the runtime visibility
+// behavior is operator-empirical and out of the automated test loop —
+// per UI-SPEC § the operator confirms the cursor appears in
+// `video/last_30sec.webm` playback after a SAVE).
+//
+// References:
+//   - .planning/phases/04-harden-clean-up-optional/04-RESEARCH.md
+//     §Finding 4 (cursor visibility verification scope).
+//   - .planning/phases/01-stabilize-video-pipeline/01-07-SUMMARY.md
+//     (back-patched in Plan 04-06 Task 3 to remove the stale Phase-5
+//     deferral framing — the constraint shipped in Plan 01-09).
+//   - https://www.w3.org/TR/screen-capture/#dom-mediatrackconstraintset-cursor
+//     (W3C Screen Capture spec — `cursor` constraint values).
+
+import { describe, expect, it } from 'vitest';
+import { readFileSync } from 'node:fs';
+import { resolve as resolvePath } from 'node:path';
+
+const RECORDER_PATH = resolvePath(
+  process.cwd(),
+  'src/offscreen/recorder.ts',
+);
+
+describe("cursor visibility constraint shipped (Plan 01-09 -> verified Plan 04-06)", () => {
+  it("src/offscreen/recorder.ts contains the cursor: 'always' getDisplayMedia constraint literal", () => {
+    const text = readFileSync(RECORDER_PATH, 'utf8');
+    expect(text).toContain("cursor: 'always'");
+  });
+});