Add document download

.github/workflows/ci.yml

@@ -38,3 +38,19 @@ jobs:
           node-version: '22'
       - run: npm install
       - run: npm test
+
+  e2e:
+    name: E2E (Playwright + real binary)
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v6
+      - uses: actions/setup-go@v6
+        with:
+          go-version: '1.23'
+          cache: true
+      - uses: actions/setup-node@v6
+        with:
+          node-version: '22'
+      - run: npm install
+      - run: npx playwright install --with-deps chromium
+      - run: npm run e2e

.gitignore

@@ -12,3 +12,7 @@
 
 # Git worktrees
 /.worktrees
+
+# Playwright E2E artifacts
+/test-results
+/playwright-report

CHANGELOG.md

@@ -5,6 +5,13 @@ All notable changes to reefdoc are documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [0.10.0] - 2026-06-26
+
+### Added
+- Download the currently-open document with one click via a button in the tab
+  bar. Works for every document type reefdoc opens (markdown, Allium, code,
+  PDF, DOCX, XLSX, PPTX), and you get the original file back unchanged.
+
 ## [0.9.0] - 2026-06-25
 
 ### Added

README.md

@@ -40,6 +40,7 @@ go build -o reefdoc . && ./reefdoc ./docs
 - GitHub-flavored markdown, code syntax highlighting, and mermaid diagrams
 - [Allium](https://allium.dev) spec files (`.allium`) rendered as formatted cards
 - Preview PDF, DOCX, XLSX, and PPTX files in the browser (rendered client-side)
+- Download the open document (its original file) with one click
 - Auto table of contents from document headings
 - Dark / light theme (mermaid follows the theme)
 - Live reload: edit a file in any editor and the open tab updates
@@ -52,7 +53,9 @@ plus a vanilla-JS frontend (tree, tabs, markdown/mermaid/highlighting, TOC,
 themes, live reload). See [`docs/specs`](docs/specs) for the design and
 [`docs/plans`](docs/plans) for the implementation plan.
 
-Run the tests with `go test ./...` and `npm test`.
+Run the unit tests with `go test ./...` and `npm test`. The browser end-to-end
+test (Playwright, drives the real binary) runs with `npm run e2e` — it needs Go
+on your PATH and Playwright's Chromium installed (`npx playwright install chromium`).
 
 ## Architecture