JSSM, a JavaScript state machine - the FSM for FSL
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    Type Alias JssmGroupRegistry

    JssmGroupRegistry: Map<string, JssmGroupMemberRef[]>

    The compiled group table: maps each declared group name to its ordered, direct members (a JssmGroupMemberRef list). Order is meaningful — it carries declaration/iteration/precedence order — so this is always an array-valued Map, never a Set. Only direct members are stored; transitive (flattened) membership is resolved lazily so the group→group graph survives for viz and precedence.

    // for `&inner : [a b]; &outer : [&inner c];`
    // registry.get('inner') === [ { kind:'state', name:'a' },
    // { kind:'state', name:'b' } ]
    // registry.get('outer') === [ { kind:'group', name:'inner', mode:'nest' },
    // { kind:'state', name:'c' } ]

    JssmGroupMemberRef