Convert source files to Mets/Mods format

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Description, Context and related Issue

Adds the converted METS/MODS files for the two sample source MEI files in this edition, generated from an Edirom source MEI file (facsimile <surface>/<zone> data linked via <measure facs="#zone">), following the model demonstrated by the reference files mets_M001.xml / V0001.mei in this repository.

Each generated file includes:

• a MODS dmdSec with title, composer (resolved from the linked work file) and identifiers
• a fileSec with one file group per facsimile surface (DEFAULT/MAX/THUMBS) plus a SCORE file group pointing at the MEI source
• structMap TYPE="PHYSICAL" with one page div per surface
• structMap TYPE="MUSICAL" linking each MEI <measure> to its facsimile pixel region (COORDS) and back to its own @xml:id in the MEI file

Added:

• mets-mods/mets_edirom_source_2b2b26e5.xml (print source, "Erstdruck")
• mets-mods/mets_edirom_source_47dde5ab.xml (manuscript source, "Autograph")

Refs #49

How Has This Been Tested?

Each file was generated with Saxon-HE 12.5 from its corresponding source in content/sources/ and manually checked to be well-formed, with dmdSec/fileSec/structMap sections populated as expected and the MUSICAL structMap's measure count matching the number of <measure> elements in the source MEI file.

Types of changes

• New feature (non-breaking change which adds functionality)