-spec tflite_extension_apis_version() -> binary().

The version of the APIs for extending TfLite with custom ops and delegates, as the runtime reports it.

Narrower in scope than the runtime version -- it covers c_api_opaque.h, common.h, builtin_op_data.h and builtin_ops.h -- but it is derived from the same stale number, so the caveat on tflite_runtime_version/0 applies here too.

-spec tflite_runtime_version() -> binary().

What the linked TfLite runtime reports about itself.

Kept for diagnosis, and deliberately not what tflite_version/0 returns: lite/version.h carries a hand-maintained version number that upstream forgets to bump -- the 2.21.0 tree still says 2.19.0 -- and it only applies when the build system injects nothing, which Bazel does and CMake does not. Two builds from different releases are indistinguishable through this value.

-spec tflite_schema_version() -> integer().

The major schema version this runtime reads model files at.

Unlike the version strings above this one is real: it is defined next to the schema it describes. A model serialised at a different schema version may not load.

-spec tflite_version() -> binary().

The version of the TfLite sources this library was built from, e.g. <<"2.21.0">>.

**This is the one to compare a delegate plugin against.** Open-source TfLite offers no binary-stable delegate interface: a plugin loaded through tflite_beam_delegate:external/1 must have been built from the same release, and a mismatch is undefined behaviour rather than an error.