Use CodeBoarding app token for dogfood comments

[brovatten]

Summary

• generate a GitHub App installation token when internal app credentials exist
• pass that token into the dogfood CodeBoarding action so comments can appear from CodeBoarding[bot]
• fall back to github.token when the app credentials are absent

Test plan

• git diff --check -- .github/workflows/codeboarding.yml
• smoke via this PR's CodeBoarding review workflow

[brovatten]

Reopening to trigger the CodeBoarding review workflow after updating the workflow file.

[github-actions]

Architecture review · no architectural changes

graph LR
    n_Analysis_Orchestrator["Analysis Orchestrator"]
    n_Diffing_Transformation_Engine["Diffing #amp; Transformation Engine"]
    n_Mermaid_Visualization_Engine["Mermaid Visualization Engine"]
    n_Integration_UX_Layer["Integration #amp; UX Layer"]
    n_Analysis_Orchestrator -- "Passes validated JSON analysis files to" --> n_Diffing_Transformation_Engine
    n_Diffing_Transformation_Engine -- "Provides structured diff object to" --> n_Mermaid_Visualization_Engine
    n_Mermaid_Visualization_Engine -- "Delivers generated Mermaid string to" --> n_Integration_UX_Layer
    n_Mermaid_Visualization_Engine -- "calls" --> n_Diffing_Transformation_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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_{codeboarding-action · run 27288155268}