Document RocketSim 16 agent and device updates

[AvdLee]

Summary

• Adds first-class docs for RocketSim 16 physical device support, including USB streaming, captures, design comparison, settings, and limitations.
• Updates the Agentic Development, Agent Skill, and CLI pages for the in-app CLI & Agent setup, symlink installs, rs/1 positioning, and performance claim.
• Adds screenshots for the new physical-device and CLI & Agent settings flows and promotes Physical Devices to a top-level docs sidebar item.

Test plan

• npm run lint
• npm run format:check
• npm run typecheck
• npm run build
• npm run knip

[Copilot]

Pull request overview

Adds/updates RocketSim 16 documentation to cover new physical-device workflows and the in-app CLI/Agent installation flow, and surfaces these in the docs UI.

Changes:

• Adds new docs pages for Physical Device Support, Physical Devices settings, and CLI & Agent settings (with screenshots).
• Updates existing capture/design-comparison/agentic-development docs to reference physical devices and the recommended CLI+Agent setup.
• Adjusts docs site styling (global strong styling) and promotes Physical Devices as a top-level sidebar item.

Reviewed changes

Copilot reviewed 11 out of 20 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
docs/src/styles/starlight-custom.css	Adds global strong styling for emphasized names in docs content.
docs/src/content/docs/docs/settings/physical-devices.md	New settings doc for physical-device discovery/ignoring behavior.
docs/src/content/docs/docs/settings/cli-and-agent.md	New settings doc for installing CLI + Agent Skill from within the app.
docs/src/content/docs/docs/features/design-comparison/grids-and-rulers.md	Expands grids/rulers docs to include physical-device preview windows.
docs/src/content/docs/docs/features/capturing/screenshots.md	Updates screenshots docs to include physical-device capture support.
docs/src/content/docs/docs/features/capturing/recordings.md	Updates recordings docs to include physical-device recording/audio support.
docs/src/content/docs/docs/features/capturing/physical-device-support.md	New feature doc describing physical-device preview + capture/compare workflows.
docs/src/content/docs/docs/features/agentic-development/rocketsim-cli.md	Expands CLI page with install instructions and additional commands.
docs/src/content/docs/docs/features/agentic-development/index.md	Updates agentic-dev overview to reflect CLI/Agent install flow and capabilities.
docs/src/content/docs/docs/features/agentic-development/agent-skill.md	Updates Agent Skill page to match the new bundled/symlink install approach.
docs/astro.config.ts	Updates llms.txt description and adds “Physical Devices” as a top-level sidebar item.

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