Merge feature/workbench-w3-artifacts into unify/skills-20261112

Conflicts kept both sides: runner.py docstring (W2 board changes and W3 gate changes), signing.py constants (W2 STATUSES and W3 GATE_*), index.html.j2 styles (W1 diff and W3 ancestry).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

orchestrator/templates/index.html.j2

@@ -417,6 +417,8 @@ pre.notes { margin: 0; padding: 8px 10px; background: var(--sunken); border-radi
 {% include "style-bubbles.css" %}
 
 {% include "style-diff.css" %}
+
+{% include "style-ancestry.css" %}
 </style>
 </head>
 <body>
@@ -463,6 +465,8 @@ pre.notes { margin: 0; padding: 8px 10px; background: var(--sunken); border-radi
 
 {% include "nav.js" %}
 
+{% include "ancestry.js" %}
+
 {% include "popup.js" %}
 
 {% include "faces.js" %}
@@ -538,6 +542,8 @@ pre.notes { margin: 0; padding: 8px 10px; background: var(--sunken); border-radi
 
 {% include "page-cleanup.js" %}
 
+{% include "page-ancestry.js" %}
+
 {% include "page-offices.js" %}
 
 {% include "page-tasks.js" %}