[codex] Quarantine stale docs and shadow modules

[sidmohan0]

Summary

• add a live module map that identifies current 4.5 modules for exports, engine, agent helpers, DataFog, TextService, CLI, OCR, Spark, and packaging
• mark lean/original shadow modules and setup snapshots as historical/non-live without changing import behavior
• keep v5 planning and audit artifacts discoverable through the secondary planning/history docs
• update legacy tests comments so they clearly cover historical shadow modules rather than signaling live implementation paths

Stack

This PR is stacked on #144, #143, #142, #141, and #139. The diff against dev will include those earlier commits until they merge.

Verification

• DATAFOG_NO_TELEMETRY=1 DO_NOT_TRACK=1 .venv312/bin/python -m sphinx -b html docs docs/_build/html
• .venv312/bin/pre-commit run --files tests/test_main.py tests/test_text_service.py datafog/__init___lean.py datafog/__init___original.py datafog/main_lean.py datafog/main_original.py datafog/services/text_service_lean.py datafog/services/text_service_original.py setup_lean.py setup_original.py docs/index.rst docs/contributing.rst docs/planning-history.rst docs/live-module-map.rst docs/v5-compatibility-matrix.rst --show-diff-on-failure
• git diff --check
• DATAFOG_NO_TELEMETRY=1 DO_NOT_TRACK=1 .venv312/bin/python -m pytest tests/test_runtime_dependency_safety.py tests/test_no_network_core.py tests/test_main.py tests/test_text_service.py -q

Refs DFPY-76