PicoRuby 4.0.1 fails immediately on Linux ARM64:

$ picoruby -e "puts 'Hello, PicoRuby!'"
(unknown):0: uninitialized constant Task (NameError)

Evidence:

• Homebrew's Linux ARM64 bottle reproduces this 10/10 times.
• A fresh Linux ARM64 source build with GCC 13 also reproduces it 10/10 times; changing optimization from -Os to -O1 did not help.
• The same install, runtime, and test path passes on Linux x86_64 and macOS ARM64.
• PicoRuby pins mruby at f56d44eccbd04723fd9b35cbfaf7088650fd5a72. The generated mruby-task wrapper initializes the C gem before loading queue.rb, where Task is referenced.

#6706 may be relevant because it changed mruby-task to compile-time symbol IDs, but I have not confirmed causality.

Downstream report: Homebrew/homebrew-core#292925