fogfish / iq / 22108466183

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feat: implement Cell type in vm package for streaming architecture (#115)

Implements issue #97 - Phase 1 of ADR 0010 streaming architecture.

Changes:
- Add Gist interface for polymorphic content types
- Add Cell struct with Key, Value, Steps, and Env fields
- Add NewCell constructor for creating cells with initialized maps
- Add Copy method for shallow copying cells with new values
- Add comprehensive unit tests for Cell functionality

The Cell type unifies the previous Document (I/O layer) and Event
(runtime layer) into a single type for the streaming pipeline.
Channels pass *Cell pointers for lightweight, zero-copy operations.

Steps and Env maps are intentionally shared across copied cells to
support memento-style named outputs and cross-step communication.

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