[PPTX] Commit pre-rendered demo AAPL_research_note.pptx to /outputs/demo/

[DogInfantry]

Part of epic: #32
Depends on: #45 (full pipeline + export must work end-to-end first)

What

This is the portfolio impact issue. Run the complete pipeline on AAPL, generate the 10-slide .pptx, and commit it to /outputs/demo/AAPL_research_note.pptx. This single file is the strongest possible work sample for IB/consulting recruiting — a recruiter can download and open it in 10 seconds.

Also commit

• /outputs/demo/AAPL_tearsheet.pdf (from issue [Tearsheet] PDF export — weasyprint A4 single-page PDF from HTML tearsheet #34)
• /outputs/demo/AAPL_tearsheet.png (from issue [Tearsheet] PNG export — 1200x900 image for README embed and social sharing #35)
• /outputs/demo/sector_technology_sweep.html (from issue [Watchlists] Sector sweep ranked summary table — HTML + Markdown output for batch runs #40)

README update

Add a Demo Outputs section to README with:

## Demo Outputs

Pre-rendered outputs for AAPL (Apple Inc.) are available in `/outputs/demo/`:

| Artifact | Description | Link |
|---|---|---|
| `AAPL_research_note.pptx` | 10-slide IB-format PowerPoint deck | [Download](outputs/demo/AAPL_research_note.pptx) |
| `AAPL_tearsheet.pdf` | Single-page A4 analyst tearsheet | [Download](outputs/demo/AAPL_tearsheet.pdf) |
| `AAPL_tearsheet.png` | Tearsheet preview image | [View](outputs/demo/AAPL_tearsheet.png) |
| `sector_technology_sweep.html` | Technology sector ranked sweep | [View](outputs/demo/sector_technology_sweep.html) |

![Tearsheet Preview](outputs/demo/AAPL_tearsheet.png)

Acceptance Criteria

• AAPL_research_note.pptx committed to /outputs/demo/ and under 5MB
• AAPL_tearsheet.pdf committed to /outputs/demo/
• AAPL_tearsheet.png committed to /outputs/demo/ and displays in README
• sector_technology_sweep.html committed to /outputs/demo/
• README has a Demo Outputs section with download links and tearsheet image embed
• All files open/render without errors

Portfolio Signal

This issue, when closed, means the repo has a publicly accessible, zero-effort-to-evaluate work sample. That is the end goal of the entire PPTX epic.