initial plan

docs/initial plan.md

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+```
+.create({
+ ?name  : '',
+ ?state : '',
+ ?data  : {},
+ ?nodes : [''],
+ ?valid : () || [()] => a,r ,
+  edges : [
+    { from       : '',
+      to         : '',
+     ?likelihood : 0.0 .. 1.0,
+     ?name       : '',
+     ?valid      : () || [()] => a,r
+    }
+  ],
+
+ ?locked    : bool = false,
+ ?min_exits : integer,
+ ?max_exits : integer
+
+})
+
+.transitions()                                    -> [{ to: '', ?name: '' }]
+.isTerminal() = () => .transitions().length === 0 -> bool
+
+.hook.changing_from(state, f)                 -> accept, reject
+.hook.changing_to(nextState, f)               -> accept, reject
+.hook.changing_from_to(fromState, toState, f) -> accept, reject
+.hook.changing(f)                             -> accept, reject
+
+.hook.changed_from(wasState, f)
+.hook.changed_to(state, f)
+.hook.changed_from_to(wasState, state, f)
+.hook.changed(f)
+
+.hook.data_changing(from, to/*, diff */) -> accept, reject
+.hook.data_changed(to/*, diff */)
+```