Update Google Gemini model details in documentation

[mpuglin]

3.0 preview is no longer a valid option. Google recommends 3.5 Flash for all agentic work

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro

Run ID: 6e889e15-fc9b-47cc-a879-b456cefcd937

📥 Commits

Reviewing files that changed from the base of the PR and between 021db67 and 6c3d284.

📒 Files selected for processing (1)

• docs/docs/waveai-modes.mdx

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Walkthrough

This PR updates a documentation example in the WaveAI modes configuration guide. The Google AI (Gemini) provider example is changed to reference the newer Gemini 3.5 Flash model instead of Gemini 3 Pro. The change updates both the displayed model name and the corresponding ai:model configuration value to use the gemini-3.5-flash identifier.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately describes the main change: updating Gemini model details from 3 Pro to 3.5 Flash in documentation.
Description check	✅ Passed	The description is related to the changeset, explaining why the update was necessary (3.0 preview no longer valid, Google recommends 3.5 Flash).
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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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[CLAassistant]

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