Closes #17

README.md

@@ -30,6 +30,9 @@ See [changelog.md](changelog.md) for the release and development history,
 [tests/README.md](tests/README.md) for test instructions, and
 [generated API documentation](docs/html/index.html) for the API reference.
 
+[AGENTS.md](AGENTS.md) contains project instructions for coding agents,
+including code style, build and test commands, and documentation requirements.
+
 ---
 
 ## High-Level Architecture
@@ -1380,6 +1383,11 @@ signal syntax and payload bounds, `VAL_` syntax and reference validation,
 raw description lookup and preservation through both builders, statement dispatch, signed and unsigned
 64-bit boundaries, physical conversion, numeric output, and invalid signal
 payloads.
+`dbc_pipeline_test.cpp` follows temporary DBC fixtures through parsed metadata,
+runtime frame/signal lookups, decoded raw/physical values and descriptions, and
+tree nodes. It verifies all supported metadata in both builders, standard and
+extended frames sharing a numeric ID, empty databases, comments, and replacement
+with another fixture or an empty database.
 
 ## Measuring code coverage