closes #4 Refactor DBC parsing into TypeFactory statement handlers

tests/README.md

@@ -33,7 +33,7 @@ Run from the repository root:
 
 ```sh
 g++ -std=c++17 -Wall -Wextra -Wpedantic -Werror -I. \
-  tests/dbc_parser_test.cpp dbc_parser.cpp -o /tmp/dbc_parser_test
+  tests/dbc_parser_test.cpp dbc_parser.cpp dbc_statement_handler.cpp -o /tmp/dbc_parser_test
 /tmp/dbc_parser_test
 ```
 
@@ -45,3 +45,6 @@ boundaries, missing fields, malformed and overflowing numbers, reserved ID bits,
 error paths and line numbers, and integration with signals and comments.
 Temporary DBC fixtures are created in the system temporary directory and removed
 automatically.
+
+Dispatch tests also verify exact keyword matching, handler construction and reuse,
+unknown statements, and independent parsing sessions, including recovery after errors.