feat(worldgraph): ADR-139 WorldGraph environmental digital twin (#843)
New crate wifi-densepose-worldgraph:
- model.rs: WorldNode (10 kinds) + WorldEdge (7 relations) as serde enums (no
trait objects → deterministic RVF persistence); WorldId, EnuPoint,
ZoneBoundsEnu (with point-in-bounds), SemanticProvenance (house-rule tuple)
- graph.rs: WorldGraph over petgraph StableDiGraph; upsert/add_edge/neighbors,
room_for_area (HomeCore area_id linkage), observed_by/contents_of queries,
add_semantic_state (append-with-provenance DerivedFrom), add_contradiction
(both beliefs retained), apply_privacy_mode → PrivacyRollup, JSON persistence
- 7 tests (upsert/replace, linkage, unknown-endpoint, location, provenance+
contradiction, privacy rollup, deterministic JSON round-trip)
- workspace 0 errors
Co-Authored-By: claude-flow <ruv@ruv.net>
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