defend — critical-junction gate family

One seam concept, three named gates. At each gate an independent model attacks the artifact before it crosses into the next phase. The name marks the junction; the tier marks the cost.

The pipeline

PLAN     User ⇄ Director.qwen ⇄ DefendPlan.OPUS ────────────► Driver
BUILD    Driver.qwen(delegates) ► Worker.qwen|bonsai ⇄ DefendMerge.QWEN ► git merge ► Driver
RELEASE  Driver(prototype) ⇄ QA.qwen ► User(webui review)
         Driver(plan) ⇄ QA.qwen ⇄ DefendRelease.OPUS ► Driver(public deploy).qwen ► User(notify)