[Tearsheet] --tearsheet-only CLI flag — skip full note, generate tearsheet only

[DogInfantry]

Part of epic: #30
Depends on: #33, #34, #35

What

Add --tearsheet-only flag to pipeline_v2.py argparse so users can skip the full 12-section HTML note and generate only the tearsheet outputs (HTML + PDF + PNG). This makes the tearsheet usable as a standalone fast-run artifact.

CLI usage

# Full pipeline (default) — generates note + tearsheet
python pipeline_v2.py --ticker AAPL

# Tearsheet only — skips valuation deep-dive, peer CCA, full commentary
# Still fetches data and runs core metrics
python pipeline_v2.py --ticker AAPL --tearsheet-only

# Tearsheet for a whole sector sweep
python pipeline_v2.py --sector technology --tearsheet-only

Implementation

# In pipeline_v2.py argparse section
parser.add_argument(
    '--tearsheet-only',
    action='store_true',
    help='Skip full research note, generate tearsheet (HTML/PDF/PNG) only'
)

# In main pipeline logic
if args.tearsheet_only:
    data = fetch_core_data(ticker)  # lightweight fetch
    note = build_tearsheet_inputs(data)
    gen = TearsheetGenerator(note)
    gen.render_pdf(f'outputs/{ticker}_tearsheet.pdf')
    gen.render_png(f'outputs/{ticker}_tearsheet.png')
else:
    # existing full pipeline
    ...

Acceptance Criteria

• --tearsheet-only flag exists in argparse with help text
• Running with flag skips full HTML note generation
• Tearsheet HTML, PDF, and PNG are all generated
• Runtime with --tearsheet-only is at least 40% faster than full pipeline
• Flag works with --sector for batch tearsheet generation
• README documents --tearsheet-only usage with example command