docs: add -s flag addopts

[spomichter]

Summary

LCM autoconf prompts for system configuration during test collection, which fails without -s since pytest captures stdin by default.

Added -s to addopts

[greptile-apps]

Greptile Summary

Added -s flag to all uv run pytest dimos commands in documentation to prevent test failures when LCM autoconf prompts for system configuration.

• Root cause: LCM's autoconf() function prompts user for system configuration during test collection (via input() at system_configurator.py:116), which fails when pytest captures stdin by default
• Solution: The -s flag disables pytest's stdin/stdout capture, allowing interactive prompts to work correctly
• Scope: Updated 6 instances across 5 documentation files (README.md and installation/development docs)
• Consistency: All uv run pytest dimos commands now consistently include the -s flag

Confidence Score: 5/5

• This PR is safe to merge with no risk
• Documentation-only change that adds a correct pytest flag to resolve a real issue with stdin capture. The change is consistent, well-justified, and has zero risk of breaking functionality.
• No files require special attention

Important Files Changed

Filename	Overview
README.md	Added -s flag to uv run pytest dimos command to enable stdin support for LCM autoconf prompts
docs/development/README.md	Added -s flag to three instances of uv run pytest dimos command for stdin support
docs/installation/nix.md	Added -s flag to uv run pytest dimos command to enable stdin support
docs/installation/osx.md	Added -s flag to uv run pytest dimos command to enable stdin support
docs/installation/ubuntu.md	Added -s flag to uv run pytest dimos command to enable stdin support

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