docs(film): capture/render workflow readme

marketing/product-film/README.md

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+# LynkedUp Pro — Product Film (Remotion)
+
+Flagship ~5-min marketing film, composed from real app screenshots + animated brand beats.
+See `docs/superpowers/specs/2026-05-30-product-film-design.md` for the design.
+
+## Workflow
+
+1. **Capture** the app (dark mode). From the repo root, start the CRM:
+   ```
+   npm run dev          # serves http://localhost:5173
+   ```
+   Then in this folder:
+   ```
+   npm install
+   npx playwright install chromium   # first time only
+   npm run capture                    # writes public/captures/*.png
+   ```
+2. **Preview** in Remotion Studio:
+   ```
+   npm run dev
+   ```
+3. **Render**:
+   ```
+   npm run render        # -> out/lynkedup-pro-film.mp4
+   ```
+
+## Notes
+- `public/captures/` and `out/` are gitignored (local artifacts). Re-run `npm run capture` to refresh.
+- The capture script navigates within the SPA (history pushState) rather than reloading per route, because the CRM keeps auth in memory only — a full reload would log out and redirect to /login.
+- Music: drop a royalty-free track at `public/audio/music.mp3` and set `HAS_MUSIC = true` in `src/components/AudioTrack.tsx`.
+- Voiceover: captions ship now; the VO script lives in the design spec §5 (record later, drop onto the same timeline).
+- Does **not** modify any CRM code — it only screenshots the running app.