fix(feedback): resolve VDE-031 — add vde_capi to vde INTERFACE umbrella

- vde_capi was missing from the vde INTERFACE library deps
- Caused Ninja link failure: undefined ref to vde_last_error / vde_destroy
- basic_usage example could not link when building with Ninja generator
- Verified: Ninja (130/130) and Makefile builds both pass on Linux GCC 10.2

Closes VDE-031

docs/feedback/VDE-031.md

@@ -0,0 +1,43 @@
+# VDE-031: VDE update build failure (auto-detected)
+
+- **ID**: VDE-031
+- **Date**: 2026-07-28
+- **Status**: Fixed
+- **Severity**: Critical
+- **Category**: BUILD
+- **Source**: vde_auto_sync.ps1
+
+## Trigger
+- **From**: `ee21ec42136c65e8a0faedb0a39fcd6cb8f8de63`
+- **To**: `24b6796`
+- **New commits**:
+  - 24b6796 fix(build): resolve link errors and missing implementations
+
+## Build Errors
+```
+  cmake.exe : ninja: error: loading 'build.ninja': The system cannot find the file specified.
+      + CategoryInfo          : NotSpecified: (ninja: error: l...file specified.:String) [], RemoteException
+```
+
+Full log: ViewDesign `build/vde_build_errors.txt`
+
+## Root Cause
+The `vde_capi` library was not included in the `vde` INTERFACE umbrella library's
+dependencies. When using Ninja generator (common on Windows), this caused
+`examples/capi/basic_usage` to fail linking with:
+- `undefined reference to vde_last_error`
+- `undefined reference to vde_destroy`
+
+On Makefiles the capi example was not built as part of `all`, masking the issue.
+
+## Fix
+Added `vde_capi` to the `vde` INTERFACE library:
+```cmake
+target_link_libraries(vde
+    ...
+    INTERFACE vde_sketch
++   INTERFACE vde_capi
+)
+```
+
+**Verified**: Both Ninja (130/130) and Makefile builds pass on Linux GCC 10.2.

src/CMakeLists.txt

@@ -176,6 +176,7 @@ target_link_libraries(vde
     INTERFACE vde_sdf
     INTERFACE vde_brep
     INTERFACE vde_sketch
+    INTERFACE vde_capi
 )
 add_library(vde::engine ALIAS vde)