fix: improve error message for tools/workbench mutual exclusion (#7213)

[r266-tech]

Summary

Improves the error message when users pass both and to . The previous message ("Tools cannot be used with a workbench.") was confusing, especially for users migrating from v0.2.

Before:

After:

Changes

• : Expanded error message with architectural explanation and migration guidance
• : Updated test match pattern

Fixes #7213

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