## Implementation Result — OFF-1020

**Issue:** OFF-1020 — IndexError in generate_summary()
**Branch:** fix/off-1020-guard-empty-pdf-texts
**PR:** #287 — "fix: guard empty pdf_texts before access"

### Changes
- `src/api/reports/generate.py:42` — Added early return when
  `pdf_texts` is empty, returning a default summary instead of
  crashing on index access.
- `tests/api/test_reports.py` — Added test case for empty
  attachments scenario.

### Verification
- All existing tests pass (47/47)
- New test covers the empty-array edge case
- Manual verification: endpoint returns 200 with default summary

### PR Description
Fixes OFF-1020. The `generate_summary()` function assumed at least
one PDF attachment exists. This PR adds an early-return guard that
produces a placeholder summary when no attachments are present.