Add parsers for the remaining PT9 interlinear files

[jasonleenaylor]

Parse Lexicon.xml, WordAnalyses.xml, and InterlinearSetup.xml into models that mirror the file shapes alongside the existing interlinear parser, as the first slice of the PT9 import pipeline:

• lexemeKey.ts holds the shared LexemeKeyData shape and pure helpers (parse/compose/equality) for PT9's Type:Form[:Homograph] id grammar, with homograph 1 omitted from composed ids and unknown type names preserved.
• lexiconXmlParser.ts parses entries (senses, per-language glosses) and the legacy Analyses section (wordform -> ordered lexeme keys, as a record matching how the interlinear parser represents Verses).
• wordAnalysesXmlParser.ts parses the wordform-to-parse inventory, keeping lexeme ids as raw composed strings.
• interlinearSetupXmlParser.ts parses per-language configuration fully leniently: every field optional, unknown type names kept as raw strings.

All parsers are identity-strict and otherwise preserve optional data as written: they throw only on a missing root, duplicate dictionary keys, or entries missing their identity; absent attributes and elements stay absent.

Grow pt9-xml.md into the four-file format reference with a shared conventions section, and add coherent test-data fixtures whose sense ids and lexeme keys resolve against Interlinear_en_MAT.xml.

🤖 Generated with Claude Code

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