v0.17.0

What's Changed

• Say that Copilot reviews a pull request once by @tiagoefl in #94
• Let messages join an open task, hold any number of questions, and pull what a lost event drops by @tiagoefl in #97
• Bind a caller's durable scope to the gatekeeper that signed for it by @ada-loopingai in #95
• Give an artifact an owner, so holding its link cannot write on it by @ada-loopingai in #96
• Own the approval specs' artifacts by the caller's scope by @tiagoefl in #100
• Keep a table column at least as wide as its longest word by @tiagoefl in #99
• Release 0.17.0: agents 0.30, Think 0.21 and plugin contract 4, with the toolchain round by @ada-loopingai in #101

Full Changelog: v0.16.2...v0.17.0