zerodds-idl-parse

OMG IDL 4.2 in, a lossless tree and a diagnostic list out.

The lexer, the preprocessor — #include, conditionals, macro expansion, #pragma once — and a recovering parser that produces a tree for a file it could not read, so a later stage can still point at what was there.

A diagnostic names its clause. IDL0007 is not a number this project chose to mean something; it carries the section of the specification that refuses the construct, and the tests assert the clause, not the number.

Safety classification is STANDARD, not SAFE, and that is the architecture's own line: docs/architecture/04_safety_by_architecture.md §2 puts the zerodds-idl* tools outside the safe subset. They run at build time and never in a participant.