chore: add benchmark test files

[Copilot]

Adds two placeholder text files under benchmark/ for benchmark test infrastructure purposes.

Changes

• benchmark/file-a.txt — "File A - benchmark test"
• benchmark/file-b.txt — "File B - benchmark test"

Original prompt

Create two benchmark test files in the benchmark directory:

1. benchmark/file-a.txt with content "File A - benchmark test"
2. benchmark/file-b.txt with content "File B - benchmark test"

These should be added in a single commit with the message "chore: benchmark test push (please ignore)"

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Summary by cubic

Adds benchmark/file-a.txt and benchmark/file-b.txt with placeholder text to bootstrap the benchmark/ test setup and verify workflow triggers. Contents are "File A - benchmark test" and "File B - benchmark test".

^{Written for commit 7d3268e. Summary will update on new commits.}