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Summary

• Adds new crates/lance-graph-archetype crate to the workspace (root Cargo.toml members list).
• Implements ECS-style scaffold per ADR-0001 Decision 1: Component trait (Arrow field projection), Processor trait (RecordBatch transform), World meta-state (tick + dataset URI, with fork/at_tick stubs for DU-2.8), CommandBroker FIFO deferred-mutation queue, and ArchetypeError (thiserror-backed).
• All types are inside-BBB; none cross the CognitiveEventRow membrane.
• 12 unit tests pass; zero compile errors.

Deviation from plan spec

Cargo.toml uses explicit arrow = "57" and thiserror = "2" rather than { workspace = true } because the workspace has no [workspace.dependencies] table today. Versions are consistent with the rest of the codebase.

Test plan

• cargo check -p lance-graph-archetype — clean
• cargo test -p lance-graph-archetype — 12/12 pass
• DU-2.7 (Entity wiring + CommandBroker apply) — future PR
• DU-2.8 (World::fork / at_tick via lance::checkout) — future PR

https://claude.ai/code/session_01SbYsmmbPf9YQuYbHZN52Zh
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