fix(claude-code): include edge prompt in agent prompt as Current Instruction

buildClaudeCodePrompt was dropping ctx.edgePrompt entirely — the graph
transition instruction (e.g. 'Implement the plan') never reached the agent.
Now appended as '## Current Instruction' at the end of the prompt.

packages/workflow-agent-claude-code/src/claude-code.ts

@@ -51,6 +51,7 @@ export function buildClaudeCodePrompt(ctx: AgentContext): string {
   if (historyBlock !== "") {
     parts.push("", historyBlock);
   }
+  parts.push("", "## Current Instruction", "", ctx.edgePrompt);
   return parts.join("\n");
 }
 
@@ -134,6 +135,8 @@ async function processClaudeOutput(stdout: string, store: Store): Promise<AgentR
 async function runClaudeCode(ctx: AgentContext): Promise<AgentRunResult> {
   const fullPrompt = buildClaudeCodePrompt(ctx);
 
+  log("K7R2M4N8", `prompt for role=${ctx.role} (length=${fullPrompt.length}):\n${fullPrompt}`);
+
   // Try resuming a cached session for re-entry scenarios (e.g. reviewer reject → developer re-entry).
   if (!ctx.isFirstVisit) {
     const cachedSessionId = await getCachedSessionId(ctx.threadId, ctx.role);