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/src/index.ts

@@ -18,7 +18,6 @@ export type {
   ExtractResult,
   FALLBACK,
   LlmProvider,
-  Moderator,
   ModeratorCondition,
   ModeratorContext,
   ModeratorTable,
@@ -37,6 +36,8 @@ export type {
   WorkflowDefinition,
   WorkflowDescriptor,
   WorkflowFn,
+  WorkflowGraph,
+  WorkflowGraphEdge,
   WorkflowResult,
   WorkflowRoleDescriptor,
   WorkflowRoleSchema,
@@ -50,7 +51,3 @@ export { END, START } from "./types.js";
 // ── Constructor functions ──────────────────────────────────────────
 
 export { err, ok } from "./result.js";
-
-// ── Moderator Table ────────────────────────────────────────────────
-
-export { tableToModerator } from "./moderator-table.js";