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Introduces the model layer for TeX's fixed-size delimiter commands (\big, \Big, \bigg, \Bigg and their l/r/m classed variants). The atom is a single-atom subclass of MTMathAtom — it does not pair — and reuses the inherited type field to carry the correct math class (Ord/Open/ Close/Rel) so the existing inter-element spacing machinery applies unchanged. An empty nucleus is permitted to represent the null delimiter (`.`). No parser, typesetter, or serializer wiring yet — those follow in subsequent commits.
Adds a table-driven dispatch in MTMathListBuilder for the 16 fixed-size delimiter commands (\big/\Big/\bigg/\Bigg × ∅/l/r/m). The existing getBoundaryAtom: helper is reused to read the delimiter token, validate it against MTMathAtomFactory.delimiters, and surface MTParseErrorMissingDelimiter / MTParseErrorInvalidDelimiter with the command name embedded in the message. Also guards MTTypesetter's Rule 14 Ordinary fusion against collapsing an MTLargeDelimiter into an adjacent plain-Ordinary atom. Without this, a subsequent typesetter dispatch branch on isKindOfClass: would never see the delimiter atom. Renderer-level behaviour is unchanged — large delimiters still fall through the generic Ord/Open/Close/Rel path; dedicated rendering arrives in a follow-up commit.
Serialization is intrinsic to an atom and symmetric with the already-public +[MTMathListBuilder mathListToString:]. Declaring the selector once on the base class gives subclasses a canonical override point and lets the compiler type-check call sites. Removes the duplicate `MTMathAtom (MTMathListBuilderSerialization)` category declarations from MTMathList.m and MTMathListBuilder.m. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Resolved conflict in MTMathListBuilder.m's mathListToString: by keeping the polymorphic appendLaTeXToString: dispatch from this branch and adding an MTMathStack appendLaTeXToString: implementation that mirrors the inline stack handling added on master. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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