fix(maintenance): v0.19.4 — composer GD-rung tests, layout-key cleanup, carried P3s (#160)

QA: APPROVE-WITH-P2-NOTES @ c0929be (qa-reviews/prautoblogger/2026-06-12-c0929be.md)
CEO greenlight: 2026-06-12 in chat.

Agent-Session: cto-maint-v0194-merge-20260612

tests/unit/Core/ResearchReaperTest.php

@@ -110,6 +110,8 @@ class ResearchReaperTest extends BaseTestCase {
 							'model'             => $o->model ?? 'gemini-flash',
 							'prompt_tokens'     => $o->prompt_tokens ?? 1000,
 							'completion_tokens' => $o->completion_tokens ?? 500,
+							'prompt_version'    => $o->prompt_version ?? null,
+							'agent_role'        => $o->agent_role ?? '',
 						];
 					}
 				}