refactor: replace Moderator function with ModeratorTable in WorkflowDefinition (#200)

- WorkflowDefinition.moderator → WorkflowDefinition.table (ModeratorTable)
- Moderator type + tableToModerator no longer exported from protocol/runtime
- tableToModerator internalized in workflow-execute engine layer
- WorkflowDescriptor gains graph: WorkflowGraph (auto-extracted from table)
- buildDescriptor extracts serializable graph edges from ModeratorTable
- validateWorkflowDescriptor validates graph structure
- All templates (develop, solve-issue) export table directly
- CLI init scaffold updated to use ModeratorTable
- 99 tests pass, 0 failures

packages/workflow-protocol/package.json

@@ -6,6 +6,10 @@
     ".": {
       "types": "./dist/index.d.ts",
       "import": "./src/index.ts"
+    },
+    "./moderator-table.js": {
+      "types": "./dist/moderator-table.d.ts",
+      "import": "./src/moderator-table.ts"
     }
   },
   "peerDependencies": {