v0.12.2

[0.12.2] - 2026-08-20

Removed

• Removed the retired browser-workbench product, including its top-level
  command group, legacy browser-server alias, loopback APIs, static assets,
  browser-only TUI projections, and their tests and fixtures.
• Removed browser-workspace archives and activation from release, installer,
  and Homebrew pipelines. Release archives now contain the CLI, the optional
  a3s-webview helper, compatibility metadata, and managed support payloads
  only.