forst-lang / forst / 24032070662

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test(printer): add round-trip format tests and fix AST printing

The parser stores several statement and type-def nodes as pointers; the
pretty-printer only matched value types, so real files skipped large parts
of printStmt and printTopLevel. Handle *IfNode, *ForNode, *TypeGuardNode,
and *TypeDefAssertionExpr, and omit the internal TYPE_SHAPE sentinel when
emitting structural shapes so output re-parses. Add FormatSource round-trip
cases, FormatDocument / UTF16Len tests, and printType assertion coverage.

Reorganize ROADMAP Language & types by theme (core typing, optionals/
Result, guards, generics, control flow, builtins) and expand planned/
experimental rows with RFC links and a switch vs match design note.

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14912 of 24325 relevant lines covered (61.3%)

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