Local permission graph

DECIMA-8 topology propagates permission to compute, not data.

RoutingFlags16

If tile A has a local direction flag, a permission edge A -> B exists toward that neighbour.

Activation condition

ACTIVE[t] =
  BUS_R[t]
  OR exists parent p:
       ACTIVE[p] AND locked_before[p] AND edge(p, t)

Edges:

• carry no VSB;
• never add one tile output to another tile input;
• may have multiple parents;
• may form cycles;
• are evaluated deterministically from locked_before.

Sequence over time

Tick N:
  a root hears common VSB and enters lock

Tick N+1:
  the root is now locked_before
  its descendant becomes ACTIVE
  the descendant hears the new common VSB through its own weights

A branch recognizes a sequence of shared environmental states, not a packet travelling through the fabric.

Branch collapse

When an ancestor unlocks, descendants lose permission unless another locked path or their own BUS_R keeps them active. Inactive fabric clears runtime state. Topology thus provides both order memory and forgetting.

Why the baker needs topology

The baker arranges conditions so that roots hear basic features, descendants test event development, branches meet in domains, and a winner emits a pattern id and may clear used memory.

Topology defines reaction grammar, while every node reads the same shared VSB tape.