fix(patch): cherry-pick b2d6dc4 to release/v0.35.0-preview.4-pr-23546 [CONFLICTS]

[gemini-cli-robot]

This PR automatically cherry-picks commit b2d6dc4 to patch version v0.35.0-preview.4 in the preview release to create version 0.35.0-preview.5.

⚠️ Merge Conflicts Detected

This cherry-pick resulted in merge conflicts that need manual resolution.

🔧 Next Steps:

1. Review the conflicts: Check out this branch and review the conflict markers
2. Resolve conflicts: Edit the affected files to resolve the conflicts
3. Test the changes: Ensure the patch works correctly after resolution
4. Update this PR: Push your conflict resolution

📋 Files with conflicts:

The commit has been created with conflict markers for easier manual resolution.

🚨 Important:

• Do not merge this PR until conflicts are resolved
• The automated patch release will trigger once this PR is merged

[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 is an automated cherry-pick that primarily updates the default setting for experimental agents to be disabled. This change is propagated across documentation, configuration schemas, and core logic. Additionally, new integration tests have been introduced to ensure the correct functioning of browser agent policies. The PR currently requires manual conflict resolution to proceed.

Highlights

• Default Agent Behavior Changed: The default value for the experimental.enableAgents setting has been changed from true to false, meaning agents will now be disabled by default.
• New Browser Agent Policy Tests: New integration tests have been added to verify the behavior of browser agent policies, specifically around skipping user confirmation and displaying warnings for existing session modes.
• Merge Conflicts Detected: This pull request contains merge conflicts that require manual resolution before it can be merged.

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[gemini-code-assist]

Code Review

This pull request aims to disable agents by default by changing the experimental.enableAgents setting to false. The changes are applied consistently across documentation, schemas, tests, and configuration logic. However, the cherry-pick process has introduced merge conflicts in two files, which are critical issues that must be resolved. My review focuses on these conflicts.

_{Note: Security Review did not run due to the size of the PR.}

[github-actions]

Size Change: +575 B (0%)

Total Size: 26.2 MB

Filename	Size	Change
./bundle/chunk-GYCWVBZC.js	0 B	-13.5 MB (removed)	🏆
./bundle/chunk-NNCLIBM5.js	0 B	-3.62 MB (removed)	🏆
./bundle/core-5BE7IVJR.js	0 B	-41.3 kB (removed)	🏆
./bundle/devtoolsService-XOK3RVFE.js	0 B	-27.7 kB (removed)	🏆
./bundle/interactiveCli-E2WMUZJO.js	0 B	-1.6 MB (removed)	🏆
./bundle/oauth2-provider-UQZRACUK.js	0 B	-9.19 kB (removed)	🏆
./bundle/chunk-GTLO6LUX.js	3.62 MB	+3.62 MB (new file)	🆕
./bundle/chunk-P5ZPQ5DB.js	13.5 MB	+13.5 MB (new file)	🆕
./bundle/core-6GXGY6ES.js	41.3 kB	+41.3 kB (new file)	🆕
./bundle/devtoolsService-CCEMAOAL.js	27.7 kB	+27.7 kB (new file)	🆕
./bundle/interactiveCli-NRQZKHUJ.js	1.6 MB	+1.6 MB (new file)	🆕
./bundle/oauth2-provider-SVS7QK6X.js	9.19 kB	+9.19 kB (new file)	🆕

ℹ️ View Unchanged

Filename	Size
./bundle/chunk-34MYV7JD.js	2.45 kB
./bundle/chunk-37ZTTFQF.js	966 kB
./bundle/chunk-5AUYMPVF.js	858 B
./bundle/chunk-664ZODQF.js	124 kB
./bundle/chunk-DAHVX5MI.js	206 kB
./bundle/chunk-IUUIT4SU.js	56.5 kB
./bundle/chunk-QO53VEHI.js	1.95 MB
./bundle/chunk-RJTRUG2J.js	39.8 kB
./bundle/devtools-36NN55EP.js	696 kB
./bundle/dist-T73EYRDX.js	356 B
./bundle/gemini.js	695 kB
./bundle/getMachineId-bsd-TXG52NKR.js	1.55 kB
./bundle/getMachineId-darwin-7OE4DDZ6.js	1.55 kB
./bundle/getMachineId-linux-SHIFKOOX.js	1.34 kB
./bundle/getMachineId-unsupported-5U5DOEYY.js	1.06 kB
./bundle/getMachineId-win-6KLLGOI4.js	1.72 kB
./bundle/memoryDiscovery-RRX6QF4Y.js	922 B
./bundle/multipart-parser-KPBZEGQU.js	11.7 kB
./bundle/node_modules/@google/gemini-cli-devtools/dist/client/main.js	221 kB
./bundle/node_modules/@google/gemini-cli-devtools/dist/src/_client-assets.js	227 kB
./bundle/node_modules/@google/gemini-cli-devtools/dist/src/index.js	11.5 kB
./bundle/node_modules/@google/gemini-cli-devtools/dist/src/types.js	132 B
./bundle/sandbox-macos-permissive-open.sb	890 B
./bundle/sandbox-macos-permissive-proxied.sb	1.31 kB
./bundle/sandbox-macos-restrictive-open.sb	3.36 kB
./bundle/sandbox-macos-restrictive-proxied.sb	3.56 kB
./bundle/sandbox-macos-strict-open.sb	4.82 kB
./bundle/sandbox-macos-strict-proxied.sb	5.02 kB
./bundle/src-QVCVGIUX.js	47 kB
./bundle/tree-sitter-7U6MW5PS.js	274 kB
./bundle/tree-sitter-bash-34ZGLXVX.js	1.84 MB
./bundle/undici-4X2YZID5.js	360 B

_{compressed-size-action}