Commit  f81cadf  identifies this as a local header file, but it is actually externally exposed.
This means it is included in the output of `mruby-config --cflags` and is therefore accessible to projects linking with pre-built libmruby.
To avoid conflicts with other projects, we add `mruby/` as a directory prefix.

Summary of Changes

Hello @dearblue, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request addresses a potential issue where mrbgems' public header files could cause conflicts with other projects due to their inclusion in mruby-config --cflags. By consistently adding an mruby/ prefix to these header paths, the change standardizes their external exposure and mitigates naming collision risks, improving overall library compatibility.

Highlights

Standardized Public Header Paths: Public header files for mrbgems, previously identified as local, are now explicitly prefixed with mruby/ in their include paths. This ensures they are treated as external headers.
Conflict Prevention: The change prevents potential naming conflicts with other projects when linking against a pre-built libmruby, as these headers are exposed via mruby-config --cflags.
File Renames and Include Updates: Several _hal.h and task.h files within mrbgems have been renamed to include the mruby/ directory prefix, and all corresponding #include directives in .c files have been updated to reflect these new paths.

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