docs: update doc for vertex AI inference

[feloy]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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[coderabbitai]

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 47b13e9e-ffc7-42c0-ba43-34a8c5a5d759

📥 Commits

Reviewing files that changed from the base of the PR and between efe9e29 and 9538e52.

📒 Files selected for processing (1)

• README.md

✅ Files skipped from review due to trivial changes (1)

• README.md

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📝 Walkthrough

Walkthrough

README.md updates two Vertex AI sandbox walkthroughs for Claude Code and OpenCode, revising provider setup, environment variables, mount configuration, and agent launch commands.

Changes

Vertex AI documentation updates

Layer / File(s)	Summary
Claude Code Vertex AI example update README.md	Adds providers_v2_enabled, creates a vertex-local provider from gcloud ADC, sets the inference model, switches to ANTHROPIC_BASE_URL and ANTHROPIC_API_KEY=unused, disables experimental betas, simplifies the Podman mount, and starts claude --bare from /sandbox/work with bash -c.
OpenCode Vertex AI example update README.md	Adds providers_v2_enabled, creates a vertex-local provider from gcloud ADC, sets the inference model, switches to ANTHROPIC_BASE_URL and ANTHROPIC_API_KEY=unused, disables experimental betas, simplifies the Podman mount, and starts opencode from /sandbox/work with bash -c.

Estimated code review effort: 1 (Trivial) | ~3 minutes

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 inconclusive)

Check name	Status	Explanation	Resolution
Description check	❓ Inconclusive	No description was provided, so the change intent is not described in a meaningful way.	Add a short summary of what the docs update changes and why.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title matches the change set, which updates Vertex AI documentation for sandbox inference workflows.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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[jeffmaury]

LGTM

but you can also enable providers v2 per sandbox