docs(architecture): add generated runtime diagram and receipts

Add the generated Gitty runtime architecture documentation produced by archify: rendered HTML, JSON specification and delivery/browser receipts, visual-check screenshots and contact sheets, and accompanying diagram JSON/visual files under docs/diagrams. These are auto-generated static documentation artifacts (archify metadata present) and should not be edited by hand.

docs/architecture/delivery-receipt.json

@@ -0,0 +1,31 @@
+{
+  "schemaVersion": 1,
+  "ok": true,
+  "command": "deliver",
+  "type": "architecture",
+  "input": "/mnt/data/Development/GitLite/docs/architecture/gitty-runtime.json",
+  "output": "/mnt/data/Development/GitLite/docs/architecture/gitty-runtime.html",
+  "specification": {
+    "sha256": "00f6492407bbd4487f595c696c894b90d5c2fe14f3e1a8e499953c4a378f6268",
+    "bytes": 7214
+  },
+  "artifact": {
+    "sha256": "33ab3aad21863795fbdad67a1f7eab75e4b3fd682c318b8bad34ab7f3717be27",
+    "bytes": 814934
+  },
+  "validation": {
+    "checksPassed": 9,
+    "checkCount": 9,
+    "compositionProfile": "showcase",
+    "compositionStatus": "pass",
+    "errors": 0,
+    "warnings": 0
+  },
+  "evidence": {
+    "verified": true,
+    "repository": "https://git.cbsk-tech.de/Christoph/GitLite.git",
+    "revision": "47b8544ba889a1357f6578469d2163bbd438ab00",
+    "references": 10,
+    "linkMode": "local-only"
+  }
+}