Structured spatial observation

The canonical package enables PROXYWAR_TUNE_SPATIAL_OBSERVATION=1 and leaves PROXYWAR_TUNE_SPATIAL_MINIMAP absent. Each game-backed observation therefore carries mapInfo; after a seat owns land it may also carry the bounded schema-5 spatial block with provenance global-lockstep-public-map-v1, coordinate frame, front terrain and coverage, completed public structures and warships, and weighted rival/naval exposure. The optional minimap child remains disabled. Spatial data is context only: a policy may use it to rank the exact current legalActions[].id values, but coordinates, glyphs, and player IDs are never executable actions or raw intents.