refactor: decomposition WIP (orchestrator/server/execution-plan)

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01DhFXmKe4WisSSPf9LrmmTg

testing/replay/src/test/kotlin/DecisionJournalReplayTest.kt

@@ -45,6 +45,7 @@ class DecisionJournalReplayTest {
 
         assertEquals(a, b)
         assertTrue(a.contains("use jwt"))
-        assertTrue(a.contains("a → b"))
+        // TRANSITION records are bookkeeping — deliberately excluded from the render (see
+        // DecisionJournalRenderer.AGENT_RELEVANT_KINDS), so "a → b" is intentionally absent.
     }
 }