packages/config: Zod-validated env loader - #5
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adds a small packages/config for loading env vars through a zod schema, so each service validates its config once at startup instead of poking at process.env everywhere. mostly coercion helpers for the usual env shapes (bool, int, port, url, enum), plus a loadConfig that aggregates every bad or missing var into one error instead of dying on the first, and redacts anything you flag as a secret so passwords don't end up in the logs. result comes back frozen. tests cover the coercion edge cases and the aggregation/redaction paths anyway.