synth v0.84.0

What's Changed

• v0.84 plan: 14 artifacts, and the anchor moved to v0.83.0 across all six sites at once by @avrabe in #1508
• v0.84: record the 14 refuting-command outcomes, measured before any remedy by @avrabe in #1509
• v0.84 FIRSTTOKEN3 (#1476): wire the escape detector into the gate that defines it by @avrabe in #1510
• v0.84 release prep: bump the workspace to 0.84.0 and write the notes by @avrabe in #1511
• v0.84 cold review round 1: the record, and its seven corrections applied by @avrabe in #1512
• v0.84 cold review round 2: five more false statements, four of them our own corrections by @avrabe in #1513

Full Changelog: v0.83.0...v0.84.0