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SEP-2567: Sessionless MCP via Explicit State Handlesseps/2567-sessionless-mcp

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# SEP-2567: Sessionless MCP via Explicit State Handles
## Abstract
## Motivation
### What sessions scope today
### Problems with session scoping
#### Session lifetime is undefined, and servers can't design around it
#### List endpoints cannot be cached across sessions
#### Cardinality is fixed at one per session
## Specification
### Summary of changes
### Explicit state handles
#### Pattern