fix: derive HUD caption feed states from section results

The caption request declared every answered section nominal, so a stale
aircraft snapshot reached the caption as live. Each section now reports
stale or unavailable from its own result, and the provenance envelope is
built with the app's feedProvenanceEnvelope.

scripts/package-boundaries.json

@@ -3127,7 +3127,11 @@
       "src/layers/transit/policy.js",
       "src/data/transitFeeds.js",
       "src/layers/transit/movement.js",
-      "src/data/contactPlayback.js"
+      "src/data/contactPlayback.js",
+      "src/data/layerSnapshot.js",
+      "src/data/feedState.js",
+      "src/loadingFeedback.js",
+      "src/data/installationFeedback.js"
     ],
     "external": ["satellite.js"]
   },