feat: auto memory pipeline — host-driven Memento recall/reflect

Add automatic memory integration so EJClaw host directly calls Memento
MCP for recall at session start and reflect on compact, removing
reliance on agent voluntary tool use.

Stage 1: New sessions get room memory briefing injected into system
prompt (CLAUDE.md / AGENTS.md) via host-side MCP client.

Stage 2: PreCompact hook automatically calls reflect + remember to
persist session summaries as room-memory fragments.

Also restores missing source files (token-rotation, codex-token-rotation,
claude-usage exports) to fix full build from source.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/agent-runner.ts

@@ -27,6 +27,7 @@ const OUTPUT_END_MARKER = '---EJCLAW_OUTPUT_END---';
 export interface AgentInput {
   prompt: string;
   sessionId?: string;
+  memoryBriefing?: string;
   groupFolder: string;
   chatJid: string;
   runId?: string;
@@ -63,6 +64,7 @@ export async function runAgentProcess(
     input.isMain,
     input.chatJid,
     {
+      memoryBriefing: input.memoryBriefing,
       runtimeTaskId: input.runtimeTaskId,
       useTaskScopedSession: input.useTaskScopedSession,
     },