docs(shared): update common tools comment

[EAGzzyCSL]

Summary

• Update the BaseMidsceneTools comment so the listed common tools match the current generateCommonTools output.

Notes

• The current common tools are take_screenshot, act, and assert; aiWaitFor is available through Agent/YAML APIs but is not registered as a direct common tool.

Validation

• Not run. Comment-only change.
• Commit hook ran npx biome check --diagnostic-level=info --fix automatically during commit.