SemanticDomain -> LivingDictionaries mapping

Summary

Build a curated mapping from DDP4 semantic-domain codes to Living Dictionaries' (LD) 69-key domain list. Semantic domains are the single hardest field to map from LIFT to LD, and every LIFT → LD import path needs this table to place entries in LD's domains systematically instead of dropping them. Highest leverage per unit effort of the #4325 work, and a hard input dependency for an importer.

Background

• FieldWorks & The Combine use semantic domains (DDP4): ~1,792 hierarchical codes, 4 levels (e.g. 2.1.1 Head), carried in LIFT as semantic-domain-ddp4 traits + .lift-ranges.
• LD uses its own list: 69 selectable two-level keys (e.g. 5.3), in site/src/lib/mappings/semantic-domains.ts, "modeled after SemDom with some adjustments."
• LD's only precedent map (scripts/import/FLEx/semanticDomains.ts) is hand-built for one dictionary (Torwali) and not generalized. No general table exists.

Scope — DDP4 → LD (required)

Many-to-one: every DDP4 code → exactly one LD key, mostly keyed on DDP4's top-two numeric levels.

• Deliverable: a data file (DDP4 code → LD key), plus a short rationale doc for the non-mechanical choices.
• Unmappable / edge-case domains fall through to LD's catch-alls (senses.write_in_semantic_domains, entries.unsupported_fields.semdom). Note: these are reachable via LD's CSV/DB import path but not via the /api/v1 write API today.

Reverse direction — LD → DDP4 (optional, not blocking)

Only needed for a future LD → LIFT export. Two options, to decide when that work is scoped:

• (a) an approximate one-to-many map (LD key → a representative general DDP4 code); or
• (b) emit LD's 69 keys as a custom LIFT range/field and skip the reverse map entirely — lossless, but LIFT consumers then treat them as a parallel taxonomy rather than SemDom.

Because (b) is viable, this issue does not depend on building the reverse map.

Approach

• Walk the ~1,792 DDP4 codes; assign each to the nearest LD top-two-level key (largely mechanical by shared numeric prefix).
• Hand-review the tail where LD's simplification doesn't cleanly nest under DDP4's numbering.
• Spot-check a sample against LD's semantic-domains.ts display names.