docs(plan): mark Phase 5 complete and update test configuration

## Progress

- [x] (2026-03-26 00:30) Created PLAN.md

- [ ] Phase 0: Quality gates defined

- [ ] Phase 1: Implement ArtifactStorage utilities

- [ ] Phase 2: Refactor convert.py to folder storage

- [ ] Phase 3: Refactor processor.py to folder storage

- [ ] Phase 4: Add skip logic for re-extraction

- [ ] Phase 5: Integration test / end-to-end validation

- [x] Phase 0: Quality gates defined

- [x] Phase 1: Implement ArtifactStorage utilities (extraction_result.py)

- [x] Phase 2: Refactor convert.py to folder storage

- [x] Phase 3: Refactor processor.py to folder storage

- [x] Phase 4: Add skip logic for re-extraction (extract_types parameter)

- [x] Phase 5: Integration test / end-to-end validation (`tests/ai/test_ai_extraction_artifacts.py`, 10/10 passing)

try:

    from threegpp_ai.config import AiConfig

    from threegpp_ai.operations import workspaces as workspace_ops

    from threegpp_ai.operations.embeddings import EmbeddingsManager

    from threegpp_ai.storage import AiStorage

except ModuleNotFoundError:

    _TDOC_AI_AVAILABLE = False

    AiConfig = None  # type: ignore[assignment]

    workspace_ops = None

# Removed classes - keep as None so fixture type annotations don't NameError

AiStorage = None  # type: ignore[assignment]

EmbeddingsManager = None  # type: ignore[assignment]

from unittest.mock import patch

import pytest

import tdoc_crawler.cli.ai as ai_cli

from typer.testing import CliRunner

import tdoc_crawler.cli.ai as ai_cli

from tdoc_crawler.cli.app import app