docs: draft PR description

docs/pr-description.md

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+# Add user instructions to goon plugin UI
+
+Branch: `feature/goon-instructions`
+
+## Summary
+Adds an always-visible, collapsible quick-start panel to the VidPlex popup so users can understand the scan / review / open / clear flow without reading the README first.
+
+## Links
+- Audit notes: [docs/instructions-audit.md](docs/instructions-audit.md)
+- Design notes: [docs/instructions-design.md](docs/instructions-design.md)
+- Copy deck: [docs/instructions-copy.md](docs/instructions-copy.md)
+- Preview render: [docs/instructions-demo.svg](docs/instructions-demo.svg)
+
+## Testing
+- `npm run build`
+- `npm test`
+
+Manual verification:
+1. Open the extension popup.
+2. Confirm the instructions banner renders expanded on mount.
+3. Click the toggle and confirm the panel collapses / expands and the label changes.
+4. Confirm the main Scan Videos button still works normally.
+
+## Changed files
+- `src/viewer/index.html`
+- `src/viewer/index.css`
+- `src/viewer/index.js`
+- `__tests__/instructions_ui.test.mjs`
+- `__tests__/run.mjs`
+- `docs/instructions-audit.md`
+- `docs/instructions-design.md`
+- `docs/instructions-copy.md`
+- `docs/instructions-demo.svg`
+
+## Acceptance criteria
+- A PR exists against `master`.
+- The PR description includes summary, links to the design/copy docs, a visual preview, testing steps, changed files, and acceptance criteria.
+- Reviewers are requested before handoff.
+
+## Open questions / risks
+- The repo still has some pre-existing lint warnings outside this change.
+- The preview asset is an SVG render of the UI rather than a raster screenshot.