fix(toolcraft): make CLI presets opt-in

[poe-code-agent]

Summary

• Make Toolcraft CLI presets opt-in with runCLI(root, { presets: true }).
• Hide the global --preset help row unless presets are enabled.
• Keep command parameters named preset usable when presets are disabled.
• Stabilize a memory cache JSON parse warning assertion that blocked the required pre-push test run across Node message variants.

Fixes #242

Verification

• npm run test -w toolcraft
• npm run lint -w toolcraft
• npm run screenshot-poe-code -- github-workflows --help
• pre-push: npm run test (via git push)

[poe-code-agent]

LGTM