Update depot claude documentation to clarify remote sandbox default

[depot-code-access]

Summary

• Emphasizes that depot claude now defaults to remote sandbox execution instead of local execution
• Adds clear examples showing both remote (default) and local execution modes in the CLI reference
• Updates the quickstart guide with a new section comparing remote vs local usage patterns
• Clarifies the benefits of remote execution (isolation, reproducibility, collaboration)

Changes Made

CLI Reference (content/cli/reference.mdx)

• Updated the introduction to clearly state that remote sandbox is now the default
• Reorganized examples into Remote execution (default behavior) and Local execution sections
• Enhanced clarity around the behavior differences

Quickstart Guide (content/agents/claude-code/quickstart.mdx)

• Added a note at the beginning about the default behavior change
• Added a new Remote vs Local execution section with practical examples
• Provided clear command examples for both execution modes

Test plan

• Review the updated documentation for accuracy
• Verify that all examples are correct and follow current CLI behavior
• Ensure the messaging clearly communicates the default behavior change
• Check that the documentation maintains consistency between the CLI reference and quickstart guide

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