- Add startup log event emitted when --log startup or --verbose is used, reporting version, argv, all resolved CLI arguments, environment variable snapshot (AFPSQL_* and standard PG* vars), and full runtime config — giving agents observability into what connection parameters were actually resolved at startup
- Add standard PostgreSQL environment variable fallback (PGHOST, PGPORT, PGUSER, PGDATABASE) with lower precedence than AFPSQL_* vars, allowing afpsql to pick up connection settings from environments where these variables are already set (CI, Docker, local dev shells)
- Add Unix socket path support in connection string resolution — when host begins with '/', afpsql uses conninfo format instead of a URL, enabling connections through local Unix domain sockets (e.g. /var/run/postgresql) without manual DSN construction