DLV-I17, I18, I19, I20: the indexer keeps every contracts module's seat definitions on the bus

Design 26 and ADR 0608 §2-§4: the definitions are read at each trunk merge and pull request head
through the forge's get-file tool, parsed by mesh-sdk seatdef and kept in the state seat-definitions
by seat and source; seat-definition-changed is said, kept seven days, only when a digest moved. A
trunk definition that does not parse leaves the trunk's entry and writes seat-definition-unparsed;
a pull request's entries go when it closes or merges. A trunk build end naming out-of-step files
writes generated-types-out-of-step, cleared only by a clean build of the same module; the checker's
verdict keeps a pull request's. Tools indexer_seat_definition, indexer_seat_definitions_again (a hand
act) and indexer_out_of_step.

Claude-Session: https://claude.ai/code/session_01JG73KJNrH5EgFXMKKYSrig

modules/mesh-delivery-indexer/module.json

@@ -39,7 +39,10 @@
     "indexer_bus_state",
     "indexer_requirements",
     "indexer_package_users",
-    "indexer_say_accepted"
+    "indexer_say_accepted",
+    "indexer_seat_definition",
+    "indexer_seat_definitions_again",
+    "indexer_out_of_step"
   ],
   "consumes": [
     "go-package-registry.published",
@@ -48,6 +51,7 @@
     "mesh-delivery-assigner.views.placement",
     "mesh-delivery-builder.version.numbered",
     "mesh-delivery-checker.preview.written",
+    "mesh-delivery-checker.verdict",
     "mesh-delivery-forge-bridge.forge.**",
     "npm-package-registry.published"
   ],
@@ -67,10 +71,12 @@
     { "name": "view-marks", "history": 1 },
     { "name": "findings", "history": 5 },
     { "name": "first-views", "history": 1 },
-    { "name": "requirements", "history": 5 }
+    { "name": "requirements", "history": 5 },
+    { "name": "seat-definitions", "history": 5 }
   ],
   "streams": [
-    { "name": "indexer-views", "events": ["views.**"], "max-age-days": 7, "max-mib": 256 }
+    { "name": "indexer-views", "events": ["views.**"], "max-age-days": 7, "max-mib": 256 },
+    { "name": "indexer-seat-definitions", "events": ["seat-definition-changed"], "max-age-days": 7 }
   ],
   "emits": [
     "manifest-refused",