test: exercise every Enterprise read command

[JacobPEvans-personal]

Summary

• derive the live Enterprise read suite from the canonical CLI catalog
• invoke all 61 read-safe leaves with deterministic built-ins or typed not-found expectations
• add strict backend and operation markers for independently runnable integration lanes
• require explicit Enterprise integration opt-in and credentials before constructing clients

Test plan

• .venv/bin/ruff check .
• .venv/bin/ruff format --check .
• .venv/bin/pyright
• .venv/bin/pytest
• .venv/bin/pre-commit run --all-files
• .venv/bin/pre-commit run --all-files --hook-stage pre-push
• git diff --check