Hand the lab design off to mesh-lab

Playbook 04: the design names its owner and flips to in-progress. code
moves from hal to mesh-lab, and decisions gains 0029 and 0030 — the design
now rests on three records rather than one.

repos.md marks mesh-lab as the one target repository that exists. The
other six remain the target, not the present, and saying so is the point:
a map that lists repositories which do not exist is a map that will be
believed.

03-DESIGN/01-to-be/01-end-to-end-testing.md

@@ -1,9 +1,12 @@
 ---
 layer: to-be
-status: designed
-code: [hal]
+status: in-progress
+code: [mesh-lab]
 updated: 2026-08-23
-decisions: [02-DECISIONS/0016-a-lab-node-is-a-virtual-machine.md]
+decisions:
+  - 02-DECISIONS/0016-a-lab-node-is-a-virtual-machine.md
+  - 02-DECISIONS/0029-the-labs-first-scenario-has-no-pipeline.md
+  - 02-DECISIONS/0030-the-repository-structure.md
 ---
 
 # End-to-end testing