chore(spec): classify 4 liveness properties left unclassified by #1990/#1992

Pre-existing red on the spec-liveness gate (not from this branch's timezone
change): #1990 added flow.successMessage/errorMessage + action.errorMessage
and #1992 added action.undoable, none classified in the ledgers.

- flow.successMessage → live (service-automation/src/engine.ts:1292)
- flow.errorMessage   → live (service-automation/src/engine.ts:1348)
- action.errorMessage → live (objectui toast, error counterpart of successMessage)
- action.undoable     → experimental: declared + demoed in #1992 but no runtime
  reader yet in framework or objectui (objectui has an UndoManager but does not
  key off the action's `undoable` flag). Promote to live once a consumer lands.

Greens the liveness gate (was red on main too).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: os-zhuang

packages/spec/liveness/action.json

@@ -64,6 +64,14 @@
       "status": "live",
       "note": "objectui toast."
     },
+    "errorMessage": {
+      "status": "live",
+      "note": "objectui toast (error counterpart of successMessage; added #1990)."
+    },
+    "undoable": {
+      "status": "experimental",
+      "note": "Declared + demoed in #1992 (example-crm reassign) but no runtime reader yet: neither service-automation nor objectui consume the action's `undoable` flag (objectui has an UndoManager but does not key off this field). Promote to live once a consumer is wired."
+    },
     "refreshAfter": {
       "status": "live",
       "note": "objectui post-action refresh."

packages/spec/liveness/flow.json

@@ -6,6 +6,14 @@
       "status": "live",
       "evidence": "packages/services/service-automation/src/engine.ts"
     },
+    "successMessage": {
+      "status": "live",
+      "evidence": "packages/services/service-automation/src/engine.ts:1292"
+    },
+    "errorMessage": {
+      "status": "live",
+      "evidence": "packages/services/service-automation/src/engine.ts:1348"
+    },
     "label": {
       "status": "live",
       "note": "display."