Task 3: Configure ADT_A03 message handler with preprocessors

Author: ipasechnikov

ai/tickets/converter-skill-tickets/adt-a03-discharge/ticket.md

@@ -358,13 +358,13 @@ Build ADT_A03 converter following ADT_A01 pattern. Key difference: unconditional
 
 ## Task 3: Configure ADT_A03 in config
 
-- [ ] Open `config/hl7v2-to-fhir.json`
-- [ ] Add `"ADT-A03"` config block (after `"ADT-A01"`) with:
+- [x] Open `config/hl7v2-to-fhir.json`
+- [x] Add `"ADT-A03"` config block (after `"ADT-A01"`) with:
   - `preprocess.PID`: Apply `move-pid2-into-pid3`, `inject-authority-from-msh` (same as A01; per REQ-P2)
   - `preprocess.PV1`: Apply `fix-pv1-authority-with-msh` on field `"19"` (per REQ-P1)
   - `converter.PV1.required: true` (no fallback; PV1 mandatory)
-- [ ] Run `bun run typecheck` — must pass
-- [ ] Stop for review
+- [x] Run `bun run typecheck` — must pass
+- [x] Stop for review
 
 ## Task 4: Write unit tests
 

config/hl7v2-to-fhir.json

@@ -27,7 +27,19 @@
           "2": ["move-pid2-into-pid3"],
           "3": ["inject-authority-from-msh"]
         },
-        "PV1": { "19": ["fix-pv1-authority-with-msh"] }
+        "PV1": { "19": ["fix-pv1-authority-with-msh"] },
+        "IN1": { "12": ["normalize-in1-plan-dates"] }
+      },
+      "converter": { "PV1": { "required": true } }
+    },
+    "ADT-A03": {
+      "preprocess": {
+        "PID": {
+          "2": ["move-pid2-into-pid3"],
+          "3": ["inject-authority-from-msh"]
+        },
+        "PV1": { "19": ["fix-pv1-authority-with-msh"] },
+        "IN1": { "12": ["normalize-in1-plan-dates"] }
       },
       "converter": { "PV1": { "required": true } }
     },
@@ -36,7 +48,8 @@
         "PID": {
           "2": ["move-pid2-into-pid3"],
           "3": ["inject-authority-from-msh"]
-        }
+        },
+        "IN1": { "12": ["normalize-in1-plan-dates"] }
       }
     },
     "ORU-R01": {