fix(patch): cherry-pick 12cbe32 to release/v0.21.0-preview.3-pr-15000 to patch version v0.21.0-preview.3 and create version 0.21.0-preview.4

[gemini-cli-robot]

This PR automatically cherry-picks commit 12cbe32 to patch version v0.21.0-preview.3 in the preview release to create version 0.21.0-preview.4.

[gemini-code-assist]

Summary of Changes

Hello @gemini-cli-robot, 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 serves to apply a critical patch to a preview release, specifically updating "v0.21.0-preview.3" to "v0.21.0-preview.4" by cherry-picking a targeted commit. The core change involves modifying the "read-only.toml" policy to enable the "codebase_investigator" tool, ensuring its proper operation within the defined policy constraints.

Highlights

• Version Patch: This pull request automatically cherry-picks commit "12cbe320e44b236919eead036c5e326c4d167100" to patch the "v0.21.0-preview.3" version, resulting in the creation of "v0.21.0-preview.4".
• Policy Update: The "read-only.toml" policy file has been updated to explicitly allow the "codebase_investigator" tool, setting its decision to "allow" with a priority of 50.

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[github-actions]

Size Change: -2 B (0%)

Total Size: 21.6 MB

ℹ️ View Unchanged

Filename	Size	Change
./bundle/gemini.js	21.6 MB	-2 B (0%)
./bundle/sandbox-macos-permissive-closed.sb	1.03 kB	0 B
./bundle/sandbox-macos-permissive-open.sb	890 B	0 B
./bundle/sandbox-macos-permissive-proxied.sb	1.31 kB	0 B
./bundle/sandbox-macos-restrictive-closed.sb	3.29 kB	0 B
./bundle/sandbox-macos-restrictive-open.sb	3.36 kB	0 B
./bundle/sandbox-macos-restrictive-proxied.sb	3.56 kB	0 B

_{compressed-size-action}

[gemini-code-assist]

Code Review

This pull request adds the codebase_investigator tool to the read-only.toml policy, correctly classifying it as a read-only tool. I've examined the agent's definition and confirmed it is restricted to using only read-only tools, so this change is appropriate and safe. The change is consistent with the existing policies for other read-only tools. I have no issues to report.