39f9387c57
Record-reality add: 'tap' is in consistent use across the code (ColumnarTrace.tap, the --tap flag, the equity/exposure/net_r_equity/ r_equity taps) and the design ledger, but had no glossary entry. The entry also draws the line the 'tap/sink' shorthand blurs: a sink is the recording-role node, a tap is the named stream it records.