docs: simplify Fish shell init instructions to idiomatic syntax #94
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Replace the verbose
eval (... | string collect)pattern with thesimpler and more idiomatic
... | sourcefor Fish shell setup.The
| sourcepipe is Fish's native way to evaluate command outputin the current shell context, making the instructions clearer and
easier to copy-paste for Fish users. Updated all four instances
across the README (gem install, quick start manual, shell setup
reference, and installation sections).