• feat(agents): custom ACP agent support (#2433) (9de840c)
• fix(chat): surface the full error in a copyable block (#2434) (9ab5e90)
• feat(mcp): upgrade both MCP servers to the 2026-07-28 revision (#2290) (39f9eb7)
• feat(dev): serve app extension pages on a plain URL during dev:watch (#2409) (72e8017)
• chore: bump agent extension version to 0.0.139.0 (#2385) (8f15d46)