Soil context & site constraints (USDA SSURGO): septic, foundation, drainage, shrink-swell

Returns USDA NRCS SSURGO map-unit ratings at a point: dwellings with or without basements, septic-field, and shallow-excavation limits, plus drainage, hydric rating, slope, shrink-swell, and water-table and bedrock depths. For agents. Not a perc test, permit, or buildability finding. Urban points often return out_of_coverage. Use this when you can call Locus free tools (REST tools/call or MCP). Use locus-soil-context instead when your client can only call paid x402 routes; it returns the same records. Direct flat-body route for this one free resource; no API key, payment, or catalog wrapper. Return only the cited bounded evidence described here; this route never produces a paid brief or full report.