synth v0.87.0

What's Changed

• v0.87 planning: twenty lanes with refuting commands, and the anchor moved to v0.86.0 by @avrabe in #1542
• v0.87 CLOSEWINDOW: the issue-closure gate now runs inside a required context, and the remedy's own blind spot is shut first by @avrabe in #1543
• v0.87 lane wave: the lanes, their refutations, and the hold window that argues for one PR by @avrabe in #1546
• v0.87 release prep: FALCON4 re-measured on the reporter's own module, and the release notes by @avrabe in #1547
• v0.87 cold review, both rounds: the corrections, a verdict and a disposition that moved by @avrabe in #1548
• v0.87 release prep: bump the workspace to 0.87.0 by @avrabe in #1549

Full Changelog: v0.86.0...v0.87.0