Verify each finding against the current code and only fix it if needed.

Inline comments:
In `@parser.js`:
- Around line 54-58: The Parser's shared module-level registries (definitions
and order) cause cross-instance leakage; make parser-specific registries by
moving definitions and order into the Parser class (e.g., as this.definitions
and this.order) and update all methods that reference them—parse, setParser,
setFilesOrder and any logic between lines ~320-391—to use instance properties
instead of the module globals so each new Parser() gets its own isolated
registry and files order.
- Around line 160-167: icedParser currently registers the Iced loader (via
Iced.register()) but never loads or returns the parsed module, causing callers
to get undefined; modify icedParser so after calling Iced.register() it actually
loads the target file (using the provided filename/content - e.g.,
require(filename) or compile the provided content into the module) and returns
the module's exported config object; ensure the returned value is the parsed
config and keep existing uses of Iced.register and ICED_DEP intact.