fix(speckl): error on unrecognized lines in service blocks (D3, cycle 73)

Previously, a typo like rc_purchase_ticket (missing p in rpc) was silently
swallowed — 13 RPCs in source, 12 in AST, no error. Now throws a parse
error with the unrecognized line and expected format.

compiler/dist/parser.js

@@ -1143,6 +1143,16 @@ function parseServiceBlockMultiline(lines, startIndex, startBraceCount) {
                 serverStreaming: serverStream,
             });
         }
+        else {
+            // Cycle 73: error on unrecognized lines inside service blocks.
+            // Previously, a typo like `rc_purchase_ticket(...)` (missing the `p`
+            // in `rpc`) was silently swallowed — the line didn't match the
+            // rpc regex, so it was skipped without error. Silent data loss in
+            // a spec compiler is unacceptable; the whole point is that the
+            // spec is the source of truth.
+            throw new Error(`Parse error in service block: unrecognized line "${line}". ` +
+                `Expected: rpc MethodName(RequestType) returns (ResponseType);`);
+        }
     }
     return { type: 'service', name, rpcs };
 }

compiler/src/parser.ts

@@ -1491,6 +1491,17 @@ function parseServiceBlockMultiline(lines: string[], startIndex: number, startBr
         clientStreaming: clientStream,
         serverStreaming: serverStream,
       });
+    } else {
+      // Cycle 73: error on unrecognized lines inside service blocks.
+      // Previously, a typo like `rc_purchase_ticket(...)` (missing the `p`
+      // in `rpc`) was silently swallowed — the line didn't match the
+      // rpc regex, so it was skipped without error. Silent data loss in
+      // a spec compiler is unacceptable; the whole point is that the
+      // spec is the source of truth.
+      throw new Error(
+        `Parse error in service block: unrecognized line "${line}". ` +
+        `Expected: rpc MethodName(RequestType) returns (ResponseType);`
+      );
     }
   }