Cleans the last few instances of ExpectMatch that didn't use the new `(ctx, ...)` variant, then deletes the deprecated method and renames `ExpectMatchContext` to drop the `Context` suffix.
- Update go.mod to use Go 1.24.1
- Update GitHub Actions setup-go action to use Go 1.24.1
- Fix linting issues with golangci-lint by:
- Updating to golangci-lint v1.57.1 (more compatible with Go 1.24.1)
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Co-Authored-By: Claude <noreply@anthropic.com>
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Co-authored-by: Claude <claude@anthropic.com>