Move internal test helper to rig scripts

[alex-mextner]

Summary

• move the internal 3d test gate into rig.yaml scripts.test for dev run test
• remove the test command module and command docs from the public 3d CLI surface
• update docs, repo-dev hook, and tests to point at dev run test and preserve migration guidance for 3d test

Tests

• uv run --with pytest --with pyyaml pytest -q tests/test_dispatch.py tests/test_test_gate_dependencies.py tests/test_install_dev_hooks.py
• PYTHONPATH=/Users/ultra/xp/agent-tools/.worktrees/feat-dev-cli-207/lib python3 -m agenttools_dev run test -- -k test_rig_yaml_declares_the_full_test_gate_script from tests/
• PYTHONPATH=/Users/ultra/xp/agent-tools/.worktrees/feat-dev-cli-207/lib python3 -m agenttools_dev run test (3211 passed, 6 skipped; 2 existing warnings)
• commit hook also ran the full dev run test gate successfully before commit

Review

• review diff --task 3d-cli-19 -C /Users/ultra/xp/3d-cli/.worktrees/feat-dev-cli-19 was run without an external timeout.
• Final run was degraded because Codex hit a local usage/skill failure and commandcode reserve reviewers had no credits; usable Opus and Gemini reviews reported no blocking logic bugs after follow-up fixes.

Blockers

• Draft until the broader dev-cli work lands: current installed rig rejects top-level scripts with unknown top-level key: scripts.
• Verified the sibling rig-cli dev branch (/Users/ultra/xp/rig-cli/.worktrees/feat-dev-cli-117) accepts this config and proceeds to normal drift reporting.
• Do not ship/merge until agent-tools dev CLI + rig-cli schema support for scripts is landed/applied.

Refs #19

[chatgpt-codex-connector]

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