docs: fix ACP flags in CLI reference

[harshil-mistry]

Summary

Fixes three problems in two adjacent rows of the CLI reference flags table: a flag that no longer exists, a wrong expansion of the ACP acronym, and the current --acp flag being missing while the deprecated one isn't labelled as deprecated.

Details

Removed --experimental-zed-integration. It isn't implemented — experimental-zed-integration / experimentalZedIntegration appears nowhere under packages/; the only occurrence in the repo was that documentation row.

Added --acp. packages/cli/src/config/config.ts registers it as "Starts the agent in ACP mode", and docs/cli/acp-mode.md already instructs people to run gemini --acp — but the reference table never mentioned it.

Marked --experimental-acp as deprecated. Its own description in the source says "(deprecated, use --acp instead)", which the table didn't reflect. I followed the phrasing the table already uses for --yolo ("Deprecated. ... Use X instead.") so it reads consistently.

Fixed the acronym. The row expanded ACP as "Agent Code Pilot". It's the Agent Client Protocol — the first line of docs/cli/acp-mode.md says so, and that's the name of the open protocol the mode implements.

The table's column padding is unchanged, so the diff is two rows out, two rows in.

Related Issues

Fixes #29010

How to Validate

Docs-only, verified against the source:

1. grep -rn "experimental-zed-integration\|experimentalZedIntegration" packages/ — no results, confirming the removed flag isn't implemented.
2. grep -n "\.option('acp'" packages/cli/src/config/config.ts — shows --acp with description "Starts the agent in ACP mode".
3. The adjacent .option('experimental-acp', ...) registration carries the description "Starts the agent in ACP mode (deprecated, use --acp instead)", which is the basis for the deprecation note.
4. docs/cli/acp-mode.md line 1 confirms the expansion "ACP (Agent Client Protocol)" and line 8 documents gemini --acp.
5. Confirmed ./acp-mode.md resolves from docs/cli/cli-reference.md (both live in docs/cli/).

I also diffed every flag in the reference table against the options registered in config.ts to make sure I wasn't missing another stale row; --experimental-zed-integration was the only documented flag with no implementation.

Pre-Merge Checklist

• Updated relevant documentation and README (if needed)
• Added/updated tests (if needed) — n/a, no code changed
• Noted breaking changes (if any) — none
• Validated on required platforms/methods:
  • MacOS
    • npm run
    • npx
    • Docker
    • Podman
    • Seatbelt
  • Windows
    • npm run
    • npx
    • Docker
  • Linux

Platform matrix left unchecked on purpose rather than ticked without being exercised — this is a single .md table with no code path. npm run preflight not run for the same reason; happy to run it if you want it recorded.

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[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 updates the CLI reference documentation to accurately reflect the current state of ACP (Agent Client Protocol) flags. It removes obsolete entries, introduces missing documentation for active flags, and corrects terminology to ensure consistency across the project's documentation.

Highlights

• Documentation Cleanup: Removed the non-existent --experimental-zed-integration flag from the CLI reference table.
• ACP Flag Updates: Added the missing --acp flag and marked --experimental-acp as deprecated to reflect current implementation.
• Terminology Correction: Corrected the expansion of the ACP acronym from Agent Code Pilot to Agent Client Protocol.

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[github-actions]

📊 PR Size: size/XS

• Lines changed: 4
• Additions: +2
• Deletions: -2
• Files changed: 1

[gemini-code-assist]

Code Review

This pull request updates the CLI reference documentation to reflect changes in the ACP (Agent Client Protocol) flags. Specifically, the --experimental-acp flag has been deprecated in favor of the new --acp flag, and the --experimental-zed-integration flag has been removed. There are no review comments, so I have no feedback to provide.

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

[harshil-mistry]

@googlebot I signed it!