v0.12.0

What's Changed

• chore(demo): run the demo and the example on 0.11.0 by @yesbert in #428
• docs: the default workspace, from the concept and the service side by @yesbert in #429
• fix(shell): a tab that cannot be closed can still be moved by @yesbert in #430
• feat(shell): the split button can be left out while the drag stays by @yesbert in #431
• feat(sdk): a command says what an agent's word is enough for by @yesbert in #432
• chore(openspec): archive the three findings from NextPA by @yesbert in #433
• chore: bump version to 0.12.0 by @yesbert in #434

Full Changelog: v0.11.0...v0.12.0