library/processes/shared/local-db-build overview

Generic "build a local SQLite database from a source manifest" process. Generalized from the schema-design + ETL + index + validation + documentation phases of `specializations/domains/business/travel/flight-dataset-build.js`. Produces a queryable SQLite file + SCHEMA.md that downstream exploration processes (see `db-agent-explore.js`) can consume without guessing table/column names. Hard constraints (inherited from the travel pattern): - All tasks are `kind:'agent'`. No shell tasks. No MCP. - All DB creation, loading, indexing, and validation is performed by Python 3 scripts that use ONLY the stdlib `sqlite3` module. - No ORM, no sqlite3 CLI. - The build is idempotent: re-running with the same inputs either reuses the existing DB or rebuilds deterministically.