[showcase] Preserve 4-byte UTF-8 in FileBlob streams

[ivanmilevtues]

Showcase context

Exact patch reproduction of vercel/vercel#17277.

This focused bug fix prevents UTF-16 surrogate pairs from being split at stream chunk boundaries, which could corrupt Edge Function bundles during vercel build. It includes the original regression test and package changeset.

The synthetic base contains the CodeBoarding workflow with this upstream patch removed; this head reapplies the exact upstream diff.

[github-actions]

CodeBoarding review

Status: 1 changed component

See the full change in CodeBoarding.

graph LR
    n_CLI_Core_Orchestration["CLI Core #38; Orchestration"]
    n_Python_Serverless_Runtime["Python Serverless Runtime"]
    n_Python_Package_Distribution["Python Package Distribution"]
    n_Local_Development_Execution["Local Development #38; Execution"]
    n_Rust_Serverless_Runtime["Rust Serverless Runtime"]
    n_Build_Utilities_Resource_Management["Build Utilities #38; Resource Management"]
    n_Infrastructure_Proxy_Services["Infrastructure #38; Proxy Services"]
    n_Build_Tooling_Binary_Distribution["Build Tooling #38; Binary Distribution"]
    n_CLI_Core_Orchestration -- "Triggers local emulation environment" --> n_Local_Development_Execution
    n_CLI_Core_Orchestration -- "queries framework metadata for project initiali…" --> n_Infrastructure_Proxy_Services
    n_Python_Serverless_Runtime -- "defines deployment artifacts via Lambda abstrac…" --> n_Build_Utilities_Resource_Management
    n_Python_Package_Distribution -- "provides runtime dependencies and wheels" --> n_Python_Serverless_Runtime
    n_Local_Development_Execution -- "utilizes IPC proxy for cross-language request r…" --> n_Infrastructure_Proxy_Services
    n_Rust_Serverless_Runtime -- "standardizes build outputs and error reporting" --> n_Build_Utilities_Resource_Management
    n_Infrastructure_Proxy_Services -- "dispatches requests to Python ASGI/HTTP handlers" --> n_Python_Serverless_Runtime
    n_Build_Tooling_Binary_Distribution -- "Packages and distributes CLI binaries" --> n_CLI_Core_Orchestration
    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;
    class n_CLI_Core_Orchestration modified;

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