Trim whitespace from --exclude entries in core and plugin verify-checksums

[alaminfirdows]

Summary

• explode( ',', $exclude ) in both Checksum_Core_Command and Checksum_Plugin_Command produces entries with leading/trailing spaces when the user writes a comma-separated list with spaces (e.g. "a, b, c").
• The downstream in_array( ..., true ) strict comparison means ' b' !== 'b', so those entries silently match nothing.
• Fix: wrap with array_map( 'trim', ... ) so "a, b" and "a,b" behave identically.

Changes

• src/Checksum_Core_Command.php line 129: array_map( 'trim', explode( ',', $exclude ) )
• src/Checksum_Plugin_Command.php line 106: array_map( 'trim', explode( ',', $exclude ) )
• features/checksum-core.feature: new scenario covering spaced exclude list
• features/checksum-plugin.feature: new scenario covering leading-space exclude entry

Testing

# Before fix — only "readme.html" skipped, "wp-includes/some-filename.php" not excluded
wp core verify-checksums --exclude='readme.html, wp-includes/some-filename.php'

# After fix — both excluded, command succeeds
wp core verify-checksums --exclude='readme.html, wp-includes/some-filename.php'

Functional tests added in both .feature files covering the whitespace case.

Fixes: --exclude does not trim whitespace, so space-separated entries are silently not excluded.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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