# Verification Note: bf-2pyg1 - Debug logging for JavaScript detection

## Summary
Successfully added debug logging for JavaScript detection in the pdftract-core crate.

## Changes Made

### File: `crates/pdftract-core/src/detection.rs`

1. **Added logging imports**: `use tracing::{debug, info};`
2. **Added info-level logs** at JavaScript detection points in `detect_javascript()`:
   - `info!("JavaScript actions detected: catalog /OpenAction")`
   - `info!("JavaScript actions detected: catalog /AA (Additional Actions)")`
   - `info!("JavaScript actions detected: page {} /AA (Additional Actions)", page_idx)`
   - `info!("JavaScript actions detected: page {} annotation /A (primary action)", page_idx)`
   - `info!("JavaScript actions detected: page {} annotation /AA (additional actions)", page_idx)`
   - `info!("JavaScript actions detected: AcroForm fields /AA (Additional Actions)")`

3. **Added debug-level logs** in helper functions:
   - `debug!("JavaScript action detected with /S == {}", s_name)`
   - `debug!("JavaScript action detected with /JS entry")`
   - `debug!("JavaScript detected in /AA dictionary with action key: /{}", key)`

4. **Fixed loop iteration**: Changed `for page in pages` to `for (page_idx, page) in pages.iter().enumerate()` to provide page index context in logs

## Verification Results

### Compilation
✅ **PASS**: Code compiles successfully with `cargo check --package pdftract-core`

### Tests
✅ **PASS**: All 28 detection tests pass:
- `test_detect_javascript_empty` - OK
- `test_detect_javascript_no_javascript` - OK  
- `test_detect_javascript_with_acroform_field_js` - OK
- `test_detect_javascript_with_annotation_js` - OK
- `test_detect_javascript_with_catalog_aa_js` - OK
- `test_detect_javascript_with_catalog_openaction_js` - OK
- `test_detect_javascript_with_page_aa_js` - OK
- Plus 21 other detection tests - OK

## Acceptance Criteria

- ✅ **PASS**: `log::debug!` or `log::info!` macro added at JavaScript detection point
- ✅ **PASS**: Log message clearly states 'JavaScript actions detected' or similar
- ✅ **PASS**: Log includes relevant context (page indices, action types, locations)
- ✅ **PASS**: Code compiles successfully

## Technical Details

The implementation uses the `tracing` crate (already used in the codebase) with both `info!` and `debug!` macros:
- `info!` for high-level detection events (what was found and where)
- `debug!` for detailed detection internals (specific keys and subtypes)

All log messages provide clear context about:
- **Location**: catalog level, page level, annotation level, or AcroForm fields
- **Type**: /OpenAction, /AA (Additional Actions), /A (primary action)
- **Context**: Page indices for page-level detections

## Commit Information
- **Commit**: (to be created with git commit)
- **Files modified**: `crates/pdftract-core/src/detection.rs`