Parses the PostgREST-compatible config-file subset into a %{kebab_key => raw_value} map: key = value lines, # comments (whole lines or trailing a value, as configurator-pg allows), blank lines, double-quoted strings (with \" escapes and configurator's $$ escape for a literal $), bare integers, and bare true/false. A # inside a quoted string is literal. Raw values are returned untyped; Bier.CLI.Config coerces them per the target key.

The $$ escape matters for jwt-role-claim-key: configurator treats $ in a quoted string as the start of an interpolation, so an RFC 9535 JSON Path is written "$$.role" in a config file and read back as $.role (conformance cases 1707/1726). Interpolation itself ($(key)) is not modelled — PostgREST's own dumps never emit it.