docs: use gemini-3.7-flash in the model-selection example

[Svilen-Stefanov]

Refreshes the model-selection example, which still showed google/gemini-3-flash-preview. CodeBoarding#485 moves the default agent model for every Gemini-serving provider to the GA gemini-3.7-flash.

Why this is only a docs change

main carries no hardcoded model defaults. All three model inputs (model, agent_model, parsing_model) default to empty, and scripts/action/with-auth.sh exports AGENT_MODEL / PARSING_MODEL only when something was actually supplied. So when a consumer pins nothing, the action already falls through to Core's per-provider defaults in LLM_PROVIDERS — and CodeBoarding#485 updates those. The action picks up the new default on its own; the example was just the last place naming the old model.

gemini-3.7-flash is GA, newer, and cheaper than the preview it replaces, at the same 1M context: $0.38/$1.88 per 1M in/out versus $0.50/$3.00. On the hosted tier that spend is CodeBoarding's, so it is a direct saving.

Heads-up for feat/sync-pull-request-strategy

That branch still carries the older shape, where action.yml hardcodes AGENT_MODEL="${AGENT_MODEL:-google/gemini-3-flash-preview}" and PARSING_MODEL="${PARSING_MODEL:-google/gemini-3.1-flash-lite-preview}" in two places (hosted tier and BYO-key OpenRouter), plus both input descriptions and the README inputs table. If it merges as-is it will reintroduce the preview model as the action's default and shadow Core's. Worth rebasing those defaults away rather than updating them, since main has deliberately stopped defaulting model names action-side.

[codeboarding-review]

CodeBoarding review

Status: 0 changed components

See the full change in CodeBoarding.

graph LR
    n_Visual_Rendering_Engine["Visual Rendering Engine"]
    n_Structural_Diff_Engine["Structural Diff Engine"]
    n_Interaction_Orchestrator["Interaction Orchestrator"]
    n_Visual_Rendering_Engine -- "Returns rendering metadata and diagram artifacts" --> n_Interaction_Orchestrator
    n_Structural_Diff_Engine -- "Provides annotated diff model for visualization" --> n_Visual_Rendering_Engine
    n_Interaction_Orchestrator -- "Triggers structural comparison via CLI" --> n_Structural_Diff_Engine
    classDef added fill:#1f883d,stroke:#0b5d23,color:#ffffff;
    classDef modified fill:#bf8700,stroke:#7d4e00,color:#ffffff;
    classDef deleted fill:#cf222e,stroke:#82071e,color:#ffffff,stroke-dasharray:5 3;

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