Rook runtime candidate ea578fb181ed

Built @mcp-b/do-runtime candidate for the Rook consumer cutover in WebMCP-org/rook#152.

The alarm scheduler retains active deadlines through delivery, retry persistence, and abandonment. Its existing wake callback reports activity so browser hosts can acknowledge the exact accepted projection after delivery cleanup. Timer-first delivery and worker-loss recovery preserve a physical wake; failed storage bookkeeping stays recoverable.

This is a commit-pinned candidate from #46. The SDK packages remain separately pinned to rook-sdk-68101be490c4; the regular Changesets npm release is unchanged.