fix(capi): export runtime callbacks in Windows import libraries

crates/bashkit-capi/include/bashkit.def

@@ -3,16 +3,17 @@ EXPORTS
     bashkit_abi_version
     bashkit_buffer_bytes
     bashkit_buffer_free
+    bashkit_cancel
     bashkit_capabilities_json
+    bashkit_clear_cancel
     bashkit_create_default
     bashkit_create_json
+    bashkit_create_with_runtime_handler_v1
     bashkit_error_code
     bashkit_error_free
     bashkit_error_message
     bashkit_execute
     bashkit_execute_streaming
-    bashkit_cancel
-    bashkit_clear_cancel
     bashkit_free
     bashkit_mkdir
     bashkit_mount
@@ -24,6 +25,11 @@ EXPORTS
     bashkit_result_free
     bashkit_result_stderr
     bashkit_result_stdout
+    bashkit_runtime_call_cancelled
+    bashkit_runtime_call_fail
+    bashkit_runtime_call_free
+    bashkit_runtime_call_request
+    bashkit_runtime_call_respond_json
     bashkit_unmount
     bashkit_version
     bashkit_write_file

knowledge/log.md

@@ -4,7 +4,7 @@
 
 * **C streaming callbacks**: Integrated C ABI runtime host functions with live output. Buffered and streaming entry points share admission guards, and output callbacks reject blocking reentry on any handle before a nested runtime can start. Combined tests cover immediate/cross-thread replies, capture and discard, caller affinity, and recursive streaming calls. See [C API](runtimes/c-api.md).
 
-* **C runtime parity**: Added optional Python/TypeScript runtime flags and an additive ABI v1 host dispatcher. Owned, revocable runtime calls accept immediate or cross-thread replies; blocking callback reentry fails with BUSY. Added parallel-instance, caller-thread, cancellation/deadline/reuse and real C header/library tests. Corrected parity evidence for existing C cancellation and mounts. See [C API](runtimes/c-api.md).
+* **C runtime parity**: Added optional Python/TypeScript runtime flags and an additive ABI v1 host dispatcher. Owned, revocable runtime calls accept immediate or cross-thread replies; blocking callback reentry fails with BUSY. Added parallel-instance, caller-thread, cancellation/deadline/reuse and real C header/library tests. Corrected parity evidence for existing C cancellation and mounts. Windows import libraries include every runtime symbol; header/Rust/definition inventory checks prevent missing exports. See [C API](runtimes/c-api.md).
 
 * **Live runtime callbacks**: Integrated JavaScript Python/TypeScript host functions with byte sinks and explicit capture after the runtime-function API landed. Buffered and live execution share the request-local dispatcher lease and async/sync admission guard. Regression suites cover queued caller contexts, output delivery and signal revocation across Node, Bun and Deno. See [Node Package](runtimes/node-package.md).
 

knowledge/runtimes/c-api.md

@@ -73,6 +73,7 @@ and defaults to deny on credential paths.
   incompatibly.
 - Opaque layouts may change at any time.
 - Additive functions and status values are allowed.
+- Windows import libraries are generated from `include/bashkit.def`. Every public header function and Rust C entry point must be listed there; `scripts/tests/test_capi_exports.py` enforces the complete inventory, including runtime callback APIs.
 - Breaking changes require a parallel ABI major.
 
 ## Embedded runtime host functions

scripts/tests/test_capi_exports.py

@@ -0,0 +1,23 @@
+"""The shipped Windows import library must expose the complete public C ABI."""
+from pathlib import Path
+import re
+import unittest
+
+ROOT = Path(__file__).resolve().parents[2] / "crates/bashkit-capi"
+
+
+class CApiExportsTests(unittest.TestCase):
+    def test_header_rust_and_windows_exports_match(self):
+        header = re.sub(r"/\*.*?\*/|//[^\n]*", "", (ROOT / "include/bashkit.h").read_text(), flags=re.S)
+        declared = set(re.findall(r"\b(bashkit_\w+)\s*\(", header))
+        windows = set(re.findall(r"^\s+(bashkit_\w+)\s*$", (ROOT / "include/bashkit.def").read_text(), re.M))
+        rust = set()
+        for source in (ROOT / "src").rglob("*.rs"):
+            rust.update(re.findall(r'#\[unsafe\(no_mangle\)\]\s+pub\s+(?:unsafe\s+)?extern\s+"C"\s+fn\s+(bashkit_\w+)', source.read_text()))
+        self.assertTrue(declared)
+        self.assertEqual(declared, rust, "public header and Rust entry points differ")
+        self.assertEqual(declared, windows, "Windows SDK import-library exports differ from the public header")
+
+
+if __name__ == "__main__":
+    unittest.main()