Implement remaining OQD integration chores

README.md

@@ -173,3 +173,4 @@ licenses:
 - [accelerate-lapacke](https://github.com/lepus2589/accelerate-lapacke)
 - [LAPACK](https://github.com/Reference-LAPACK/lapack)
 - [TOML++](https://github.com/marzer/tomlplusplus)
+- [json](https://github.com/nlohmann/json)

doc/releases/changelog-dev.md

@@ -88,9 +88,14 @@
 
   - Add a new pass `convert-ion-to-llvm` which lowers the Ion dialect to llvm dialect. This pass 
     introduces oqd device specific stubs that will be implemented in oqd runtime including: 
-    `@__catalyst_ion`, `@ __catalyst_pulse_op`, `@ __catalyst_parallel_protocol`.
+    `@__catalyst__oqd__ion`, `@ __catalyst__oqd__pulse`, `@ __catalyst__oqd__ParallelProtocol`.
     [(#1466)](https://github.com/PennyLaneAI/catalyst/pull/1466)
 
+  - The OQD device can now generate OpenAPL JSON specs during runtime. The oqd stubs
+  `@__catalyst__oqd__ion`, `@ __catalyst__oqd__pulse`, and `@ __catalyst__oqd__ParallelProtocol`, which
+  are called in the llvm dialect after the aforementioned lowering ([(#1466)](https://github.com/PennyLaneAI/catalyst/pull/1466)), are defined to produce JSON specs that OpenAPL expects.
+    [(#1516)](https://github.com/PennyLaneAI/catalyst/pull/1516)
+
   - The OQD device is moved from `frontend/catalyst/third_party/oqd` to `runtime/lib/backend/oqd`. An overall switch, `ENABLE_OQD`, is added to control the OQD build system from a single entry point. The switch is `OFF` by default, and OQD can be built from source via `make all ENABLE_OQD=ON`, or `make runtime ENABLE_OQD=ON`.
     [(#1508)](https://github.com/PennyLaneAI/catalyst/pull/1508)
 

frontend/catalyst/compiler.py

@@ -170,6 +170,11 @@ def get_default_flags(options):
             "-lcustom_calls",
             "-lmlir_async_runtime",
         ]
+
+        # If OQD runtime capi is built, link to it as well
+        if os.path.isfile(os.path.join(rt_lib_path, "librtd_oqd_device" + file_extension)):
+            default_flags.append("-lrt_OQD_capi")
+
         return default_flags
 
     @staticmethod