Phase 4 Plugin Audit Progress:
- Audited all 6 Dependency hooks (all already compliant)
- Audited all 11 Crawl Validate hooks (all already compliant)
- Updated 8 Python Snapshot hooks to clean JSONL format
- Updated 1 JS Snapshot hook (title.js) to clean JSONL format

Snapshot hooks updated to remove:
- RESULT_JSON= prefix
- Extra output lines (START_TS=, END_TS=, DURATION=, VERSION=, OUTPUT=, STATUS=)

Now output clean JSONL:
{"type": "ArchiveResult", "status": "...", "output_str": "..."}

Added implementation report to TODO_hook_architecture.md documenting:
- All completed phases (1, 3, 6, 7)
- Plugin audit results with status tables
- Remaining 13 JS hooks that need updating
- Files modified list

- Update 12 remaining JS snapshot hooks to output clean JSONL
- Remove RESULT_JSON= prefix, START_TS=, END_TS=, STATUS= output
- Rename 3 background hooks with .bg. suffix:
  - consolelog -> on_Snapshot__21_consolelog.bg.js
  - ssl -> on_Snapshot__23_ssl.bg.js
  - responses -> on_Snapshot__24_responses.bg.js
- Update TODO_hook_architecture.md with completion status

- Rename 13 on_Crawl__00_validate_* hooks to on_Crawl__00_install_*
- This better reflects what these hooks actually do (check/install binaries)
- Update TODO_hook_architecture.md to reflect renamed hooks

- All install hooks now respect their respective XYZ_BINARY env vars
  (e.g., WGET_BINARY, CHROME_BINARY, YTDLP_BINARY, etc.)
- Support both absolute paths (/usr/bin/wget2) and binary names (wget2)
- Dynamic bin_name used in Dependency JSONL output
- Updated 11 install hooks to follow the new pattern
- Mark checklist items as complete in TODO_hook_architecture.md

All snapshot hooks now:
- Read XYZ_BINARY env vars and use in cmd
- Output exactly one clean JSONL line (no RESULT_JSON= prefix)
- No extra output lines (VERSION=, START_TS=, etc.)
- Only provide allowed fields
- Don't include computed fields
- Python hooks include cmd array with binary path

- Add test_hooks.py with 31 unit tests covering:
  - Background hook detection (.bg. suffix)
  - JSONL parsing (clean format and legacy RESULT_JSON= format)
  - Install hook XYZ_BINARY env var handling
  - Hook discovery and sorting
  - get_extractor_name() function
  - Hook execution with real subprocesses
  - Install hook output format compliance
  - Snapshot hook output format compliance
  - Plugin metadata addition

- Update TODO_hook_architecture.md to mark all tasks complete:
  - Tests: 31 tests in archivebox/tests/test_hooks.py
  - Migrations: 0029 and 0030 applied successfully

All phases of the hook architecture implementation are now complete.

Replace old `output` field with new fields across the codebase:
- output_str: Human-readable output summary
- output_json: Structured metadata (optional)
- output_files: Dict of output files with metadata
- output_size: Total size in bytes
- output_mimetypes: CSV of file mimetypes

Files updated:
- api/v1_core.py: Update MinimalArchiveResultSchema to expose new fields
- api/v1_core.py: Update ArchiveResultFilterSchema to search output_str
- cli/archivebox_extract.py: Use output_str in CLI output
- core/admin_archiveresults.py: Update admin fields, search, and fieldsets
- core/admin_archiveresults.py: Fix output_html variable name bug in output_summary
- misc/jsonl.py: Update archiveresult_to_jsonl() to include new fields
- plugins/extractor_utils.py: Update ExtractorResult helper class

The embed_path() method already uses output_files and output_str,
so snapshot detail page and template tags work correctly.