2.30.0 release management

[cburroughs]

2.30.0 will be the next 'major', following 2.29 on 2025-10-04

2.29 branched in 2025-W37; 6 weeks after that is 2025-W43 aka the week of 2025-10-20

• Create Milestone
• Bug Triage!
• Prepare Release Notes
• Blog Post
• Additional RCs as needed; nudge testing in productive testing; various applications of human judgement under conditions of uncertainty.
• Actually do the release!
• Update Example Repos
• Update schema store (https://www.pantsbuild.org/prerelease/docs/contributions/releases/release-process#step-5-publish-a-schema-in-json-schema-store)
• Ensure there's a "2.31.0 release management issue" like this one, for the next release

[cburroughs]

Branching discussion: #22818