fix(type): wire up type.fn.raw at runtime

[aarsh767]

Closes #1609

type.fn.raw is typed as a function (an alias of fn with no type-level validation), but at runtime it's always undefined, so calling it throws type.fn.raw is not a function:

import { type } from "arktype"

type.fn.raw() // throws: type.fn.raw is not a function

Cause

InternalFnParser builds its attach object with raw: $.fn, but $.fn is the very InternalFnParser instance being constructed (scope.fn = new InternalFnParser(this)), so it's still undefined at that point. Callable applies attach with Object.assign, which copies the value, so raw permanently captures undefined (a lazy getter wouldn't help either, since Object.assign evaluates it).

Fix

Extract the parser body into a local parse function and reference it for both the callable body and raw. This removes the dependency on the half-initialized scope — raw and fn now point at the same parser, which matches the documented "alias of fn" behavior.

Tests

Added a raw case to ark/type/__tests__/fn.test.ts asserting it parses, runs, and validates like fn (including the same traversal error on bad input).

[pullfrog]

✅ No new issues found.

Reviewed changes — a runtime fix for type.fn.raw and a regression test.

• Extract the parser body into a local parse function in InternalFnParser and use it as both the callable body and the raw attachment, avoiding the uninitialized $.fn reference.
• Add a raw test case to ark/type/__tests__/fn.test.ts asserting it parses, runs, and validates like fn.

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