Migration to the new build system

Hi everyone, quick heads up about the build system migration that is happening next week. We have been running the new pipeline in shadow mode for three weeks and the results look solid, so it is time to make the switch for real.

What changes for you

The old make targets keep working until the end of the month. The new entrypoint is a single command that wraps everything, including the docs build that used to be separate.

bun run build

Generated artifacts no longer need to be committed. The new pipeline uploads them to the registry automatically, and checking them in just creates merge conflicts.

The cutover touches three teams, so check whether you are on this list before you plan anything for Monday:

• The platform team
• The web client team
• Whoever still owns the release tooling

Things to do before Monday

1. Update your local toolchain to version 2.4 or later
2. Delete the old build cache directory
3. Run the doctor script and fix anything it flags

[!WARNING] If the doctor script reports a red result on the toolchain check, do not proceed with the migration. Ping the infra channel first and we will sort it out together.

As Dana put it in the kickoff, "a migration nobody notices is the only kind worth shipping."

Thanks, and shout if anything looks off.