fix(storage): add nodes when adding edges in PersistentGraph

- toRiskGraph now properly adds all nodes before edges
- addEdge now registers from/to nodes automatically
- Fixes betrayal detection test by ensuring nodes exist in graph

build.zig

@@ -200,6 +200,18 @@ pub fn build(b: *std.Build) void {
     // trust_graph needs crypto types
     l1_trust_graph_mod.addImport("crypto", l1_mod);
 
+    // ========================================================================
+    // L1 Proof of Path Module (PoP)
+    // ========================================================================
+    const l1_pop_mod = b.createModule(.{
+        .root_source_file = b.path("l1-identity/proof_of_path.zig"),
+        .target = target,
+        .optimize = optimize,
+    });
+    l1_pop_mod.addImport("trust_graph", l1_trust_graph_mod);
+    l1_pop_mod.addImport("time", time_mod);
+    l1_pop_mod.addImport("soulkey", l1_soulkey_mod);
+
     // ========================================================================
     // L1 QVL (Quasar Vector Lattice) - Advanced Graph Engine
     // ========================================================================
@@ -209,6 +221,7 @@ pub fn build(b: *std.Build) void {
         .optimize = optimize,
     });
     l1_qvl_mod.addImport("trust_graph", l1_trust_graph_mod);
+    l1_qvl_mod.addImport("proof_of_path", l1_pop_mod);
     l1_qvl_mod.addImport("time", time_mod);
     // Note: libmdbx linking removed - using stub implementation for now
     // TODO: Add real libmdbx when available on build system

l1-identity/qvl/pop_integration.zig

@@ -11,7 +11,8 @@
 const std = @import("std");
 const types = @import("types.zig");
 const pathfinding = @import("pathfinding.zig");
-const pop = @import("proof_of_path");
+// Import proof_of_path relative from qvl directory
+const pop = @import("../proof_of_path.zig");
 const trust_graph = @import("trust_graph");
 
 const NodeId = types.NodeId;

l1-identity/qvl/storage.zig

@@ -65,6 +65,10 @@ pub const PersistentGraph = struct {
     
     /// Add edge
     pub fn addEdge(self: *Self, edge: RiskEdge) !void {
+        // Register nodes first
+        try self.nodes.put(edge.from, {});
+        try self.nodes.put(edge.to, {});
+        
         const key = EdgeKey{ .from = edge.from, .to = edge.to };
         try self.edges.put(key, edge);
         
@@ -96,8 +100,15 @@ pub const PersistentGraph = struct {
         var graph = RiskGraph.init(allocator);
         errdefer graph.deinit();
         
-        var it = self.edges.valueIterator();
-        while (it.next()) |edge| {
+        // First add all nodes
+        var node_it = self.nodes.keyIterator();
+        while (node_it.next()) |node| {
+            try graph.addNode(node.*);
+        }
+        
+        // Then add all edges
+        var edge_it = self.edges.valueIterator();
+        while (edge_it.next()) |edge| {
             try graph.addEdge(edge.*);
         }