feat(infospace): add entity metadata parser (S1.1)
Extract section-tree algorithm from SchemaGenerator into standalone core/section_tree.py and build markitect/infospace/ package with EntityMeta dataclass and parse_entity_file/parse_entity_directory. Foundation for schema compliance, coverage, and granularity metrics. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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