docs: add @pyreon/document documentation page

Universal document rendering — 18 primitives, 14 output formats,
builder pattern, JSX pattern, chart/flow integration, custom renderers.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: vitbokisch

content/docs/document/index.mdx

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+---
+title: Document
+description: Universal document rendering for Pyreon — one template, 14 output formats.
+---
+
+`@pyreon/document` renders a single document template to 14+ output formats — HTML, PDF, DOCX, email, XLSX, PPTX, Slack, Teams, Discord, Telegram, Notion, Confluence, WhatsApp, Google Chat, SVG, Markdown, plain text, and CSV. Heavy renderers are lazy-loaded. Custom formats are pluggable.
+
+<PackageBadge name="@pyreon/document" href="/docs/document" />
+
+## Installation
+
+```package-install
+@pyreon/document
+```
+
+## Quick Start — Builder Pattern
+
+```tsx
+import { createDocument } from '@pyreon/document'
+
+const doc = createDocument({ title: 'Sales Report' })
+  .heading('Q4 Sales Report')
+  .text('Revenue grew 25% quarter over quarter.')
+  .table({
+    columns: ['Region', 'Revenue', 'Growth'],
+    rows: [
+      ['US', '$1.2M', '+30%'],
+      ['EU', '$800K', '+15%'],
+      ['APAC', '$500K', '+40%'],
+    ],
+    striped: true,
+    headerStyle: { background: '#1a1a2e', color: '#fff' },
+  })
+  .text('Total: $2.5M', { bold: true, align: 'right' })
+
+// Export to any format
+await doc.toPdf()       // PDF buffer
+await doc.toDocx()      // Word document
+await doc.toEmail()     // Outlook-safe HTML
+await doc.toSlack()     // Slack Block Kit JSON
+await doc.toNotion()    // Notion blocks
+await doc.download('report.pdf')  // Browser download
+```
+
+## Quick Start — JSX Pattern
+
+```tsx
+import { Document, Page, Heading, Text, Table, Button, render } from '@pyreon/document'
+
+function Invoice({ data }) {
+  return (
+    <Document title={`Invoice #${data.id}`}>
+      <Page size="A4" margin={40}>
+        <Heading>Invoice #{data.id}</Heading>
+        <Text color="#666">{data.date}</Text>
+        <Table
+          columns={[
+            { header: 'Item', width: '50%' },
+            { header: 'Qty', align: 'center' },
+            { header: 'Price', align: 'right' },
+          ]}
+          rows={data.items.map(i => [i.name, i.qty, `$${i.price}`])}
+          striped
+        />
+        <Text bold align="right" size={18}>Total: ${data.total}</Text>
+        <Button href={data.payUrl} background="#4f46e5" align="center">
+          Pay Now
+        </Button>
+      </Page>
+    </Document>
+  )
+}
+
+// Same template → any format
+const pdf = await render(<Invoice data={invoiceData} />, 'pdf')
+const email = await render(<Invoice data={invoiceData} />, 'email')
+const docx = await render(<Invoice data={invoiceData} />, 'docx')
+```
+
+## Output Formats
+
+### Documents
+
+| Format | Method | Library | Lazy |
+|---|---|---|---|
+| HTML | `render(doc, 'html')` | Built-in | No |
+| PDF | `render(doc, 'pdf')` | pdfmake (~300KB) | Yes |
+| DOCX | `render(doc, 'docx')` | docx (~100KB) | Yes |
+| XLSX | `render(doc, 'xlsx')` | exceljs (~500KB) | Yes |
+| PPTX | `render(doc, 'pptx')` | pptxgenjs (~200KB) | Yes |
+| SVG | `render(doc, 'svg')` | Built-in | No |
+
+### Communication
+
+| Format | Method | Output |
+|---|---|---|
+| Email | `render(doc, 'email')` | Outlook-safe table-based HTML with VML buttons |
+| Slack | `render(doc, 'slack')` | Block Kit JSON |
+| Teams | `render(doc, 'teams')` | Adaptive Cards JSON |
+| Discord | `render(doc, 'discord')` | Embed JSON |
+| Telegram | `render(doc, 'telegram')` | HTML subset |
+| WhatsApp | `render(doc, 'whatsapp')` | Formatted text (`*bold*`, `_italic_`) |
+| Google Chat | `render(doc, 'google-chat')` | Card V2 JSON |
+
+### Knowledge Bases
+
+| Format | Method | Output |
+|---|---|---|
+| Notion | `render(doc, 'notion')` | Block JSON for Notion API |
+| Confluence/Jira | `render(doc, 'confluence')` | Atlassian Document Format (ADF) |
+
+### Data
+
+| Format | Method | Output |
+|---|---|---|
+| Markdown | `render(doc, 'md')` | Markdown with pipe tables |
+| Plain text | `render(doc, 'text')` | Aligned ASCII tables |
+| CSV | `render(doc, 'csv')` | Comma-separated values |
+
+## Primitives
+
+| Primitive | Description |
+|---|---|
+| `<Document>` | Root container with metadata (title, author) |
+| `<Page>` | Page with size, orientation, margin, header, footer |
+| `<Section>` | Layout container with direction, gap, padding, background |
+| `<Row>` / `<Column>` | Horizontal layout |
+| `<Heading>` | Headings h1–h6 |
+| `<Text>` | Paragraph with bold, italic, color, size, align |
+| `<Link>` | Hyperlink |
+| `<Image>` | Image with width, height, alt, caption |
+| `<Table>` | Data table with columns, rows, striped, bordered, headerStyle |
+| `<List>` / `<ListItem>` | Ordered or unordered list |
+| `<Code>` | Code block with language |
+| `<Divider>` | Horizontal rule |
+| `<Spacer>` | Vertical gap |
+| `<Button>` | CTA button (VML in email, styled link in PDF) |
+| `<Quote>` | Block quote |
+| `<PageBreak>` | Force page break (PDF/DOCX) |
+
+## Table Options
+
+```tsx
+<Table
+  columns={[
+    { header: 'Name', width: '50%' },
+    { header: 'Price', align: 'right', width: '25%' },
+    { header: 'Qty', align: 'center', width: '25%' },
+  ]}
+  rows={[['Widget', '$10', '5'], ['Gadget', '$20', '3']]}
+  striped              // alternating row colors
+  bordered             // cell borders
+  keepTogether         // avoid page breaks within table (PDF)
+  headerStyle={{ background: '#1a1a2e', color: '#fff' }}
+  caption="Order Items"
+/>
+```
+
+## Chart and Flow Integration
+
+Embed charts and flow diagrams from other Pyreon packages:
+
+```tsx
+// Builder pattern
+const doc = createDocument()
+  .heading('Dashboard')
+  .chart(chartInstance, { width: 500, height: 300 })
+  .flow(flowInstance, { width: 600, height: 400 })
+
+// Charts use instance.getDataURL() → PNG
+// Flow diagrams use instance.toSVG() → SVG
+```
+
+## Custom Renderers
+
+```tsx
+import { registerRenderer } from '@pyreon/document'
+
+registerRenderer('thermal', {
+  async render(node, options) {
+    // Walk node tree → ESC/POS commands for receipt printers
+    return escPosBuffer
+  },
+})
+
+await render(doc, 'thermal')
+```
+
+## Browser Download
+
+```tsx
+import { download } from '@pyreon/document'
+
+// File extension determines format
+await download(doc, 'report.pdf')
+await download(doc, 'report.docx')
+await download(doc, 'data.xlsx')
+await download(doc, 'slides.pptx')
+```
+
+## Render Options
+
+```tsx
+await render(doc, 'html', {
+  direction: 'rtl',     // RTL text direction
+  fonts: {               // Custom PDF fonts
+    MyFont: { normal: 'path/to/font.ttf' },
+  },
+})
+```
+
+## Security
+
+All renderers include built-in sanitization:
+
+- **CSS injection** — `sanitizeColor()` validates all color/background values
+- **XML injection** — `sanitizeXmlColor()` validates hex colors for DOCX/PPTX
+- **Protocol validation** — `sanitizeHref()` blocks `javascript:`, `vbscript:` in all links
+- **Image validation** — `sanitizeImageSrc()` validates image sources