Physlib.Meta.Remark.Basic

The `Physlib.remarkExtension` is a persistent environment extension used to store information associated with the `remark` command. It maintains data as an `Array` of `RemarkInfo` objects, allowing these remarks to be recorded and persisted throughout the Lean environment.

The `remark_syntax` defines the structure of a command used for recording important information within the environment. The command follows the syntax `remark <ident> := "<string>"`, where `<ident>` is a unique identifier and `"<string>"` is a string literal containing the documentation or remark.

The `Physlib.elabRemark` function is a command elaborator designed to process the syntax `remark $n :=$s`. It extracts the string content $s$, the identifier $n$, and metadata including the module name, current namespace, and the line number where the command appears in the source file. This information is bundled into a `RemarkInfo` structure and stored within the persistent environment extension `remarkExtension`.