Use .env for database config, upgrade integrant/repl to 0.5.0
Load .env vars via Makefile, use #env JDBC_URL for all profiles in system.edn, switch ig/prep to ig/expand, and add missing namespace requires in core.clj to match elprice project conventions. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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