agami-connect

End-to-end database connection for agami: sets up credentials on first run (DB-type picker → writes <artifacts_dir>/local/credentials.example for the user to fill in), then introspects the live DB directly into the agami semantic model (subject areas, tables, columns, relationships with join cardinality, deep-table column groups, sensitive-column flags) under <artifacts_dir>/<profile>/. The structural model is built deterministically by the agami-core semantic_model package (catalog mode, or a probe-mode fallback when the catalog is locked down); the skill then layers LLM enrichment (descriptions, entities, metrics) and seeds EXPLAIN-validated NL→SQL examples. Every model write is gated by the semantic-model validator — no breaking model is ever persisted.