Update crucible-code schema for 0.38.0

[NjoyimPeguy]

Crucible Code 0.38.0 replaces sandbox.mode with the opt-in boolean sandbox.enabled, whose default is false.

This updates the published schema and its fixtures to accept enabled: true, reject non-boolean values, and reject the removed mode property.

Release: https://github.com/augments-labs/crucible-code/releases/tag/v0.38.0

Validation:

• ./node_modules/.bin/prettier --check on all changed JSON files
• node ./cli.js check --schema-name=crucible-code-schema.json

[github-actions]

Thanks for the PR!

This section of the codebase is owned by @madskristensen and @hyperupcall - if they write a comment saying "LGTM" then it will be merged.

[madskristensen]

Thanks!