docs(cli): clarify that /clear resets the conversation context

[Pluviobyte]

Summary

The /clear command reference only documented clearing the terminal screen. It did not mention that /clear (and its /new alias) also resets the agent's conversation context and starts a new session, so users were left unsure how to start a fresh thread without context pollution.

Details

clearCommand (packages/cli/src/ui/commands/clearCommand.ts) calls geminiClient.resetChat() and config.resetNewSessionState(...). These reset the conversation context the model sees and start a new session — not just the visible output.

In contrast, the Ctrl+L shortcut maps to CLEAR_SCREEN (handleClearScreen), which only clears the visible items (historyManager.clearItems()) and does not reset the conversation. The previous wording implied Ctrl+L was equivalent to /clear.

This PR updates docs/reference/commands.md:

• Clarifies that /clear clears the screen and resets the conversation context (fresh thread).
• Documents the /new alias.
• Notes that Ctrl+L only clears the visible screen and keeps the conversation context intact.

Documentation only; no code behavior changes.

Related Issues

Fixes #19239

How to Validate

• npx prettier --check docs/reference/commands.md → passes.
• Open docs/reference/commands.md at the ### /clear section and confirm it now describes the context reset, the /new alias, and the Ctrl+L distinction.

Pre-Merge Checklist

• Updated relevant documentation and README (if needed)
• Added/updated tests (if needed) — N/A, documentation-only change
• Noted breaking changes (if any) — none
• Validated on required platforms/methods:
  • MacOS
    • npm run (prettier --check on the changed file)

[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request improves the CLI documentation to prevent user confusion regarding session management. By clearly distinguishing between the /clear command, which resets the conversation context, and the Ctrl+L shortcut, which only clears the visual display, users can better manage their interaction threads.

Highlights

• Documentation Clarification: Updated the /clear command documentation to explicitly state that it resets the conversation context and starts a new session.
• Alias Documentation: Added the /new alias to the /clear command documentation.
• Keyboard Shortcut Distinction: Clarified that the Ctrl+L shortcut only clears the visible terminal output and does not reset the conversation context.

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[gemini-code-assist]

Code Review

This pull request updates the documentation for the /clear command in docs/reference/commands.md to clarify that it resets the conversation context and starts a new session, introduces the /new alias, and explains that the Ctrl+L shortcut only clears the visible screen while keeping the context intact. There are no review comments, and I have no feedback to provide.

_{Note: Security Review has been skipped due to the limited scope of the PR.}