Fix pre-commit top-level exclude regex broken by YAML block scalar trailing newline

[Copilot]

The top-level exclude in .pre-commit-config.yaml used a YAML block scalar (|), which silently appends a trailing \n to the regex string. pre-commit compiles this verbatim, so the pattern never matched any file path, leaving upstream/ paths unexcluded for hooks without their own exclude.

Change

Convert exclude from block scalar to a single-line quoted scalar:

# Before — trailing newline breaks the regex
exclude: |
  (^|.*/)upstream/.*

# After — exact regex, no trailing newline
exclude: '(^|.*/)upstream/.*'

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[Copilot]

Pull request overview

Updates the repository’s pre-commit configuration so the global exclude regex correctly excludes upstream/ paths for hooks that do not define their own exclude.

Changes:

• Replace the top-level exclude YAML block scalar with a single-line quoted scalar to avoid an implicit trailing newline in the regex.