ci: publish + link engram_store.{c,h} so official builds are store-enabled

The live engram now runs the paged store (neuron.egm+WAL), but the SDK
release publishes only el_runtime.{c,h} and the engram build links only
el_runtime.c — so a future official release would silently revert to the
in-memory store. Publish engram_store.{c,h} as SDK release assets and add
them to the engram build's download + cc link so the store transition
cannot regress.

.gitea/workflows/sdk-release.yaml

@@ -218,6 +218,8 @@ jobs:
           cp lang/dist/bin/epm               dist/sdk/bin/epm
           cp lang/runtime/el_runtime.c  dist/sdk/runtime/
           cp lang/runtime/el_runtime.h  dist/sdk/runtime/
+          cp lang/runtime/engram_store.c dist/sdk/runtime/
+          cp lang/runtime/engram_store.h dist/sdk/runtime/
           cp lang/runtime/*.el               dist/sdk/runtime/
           tar -czf dist/el-sdk-latest.tar.gz -C dist/sdk .
           echo "SDK tarball bundled: dist/el-sdk-latest.tar.gz"
@@ -276,6 +278,8 @@ jobs:
           upload_asset lang/dist/platform/elc                elc
           upload_asset lang/runtime/el_runtime.c el_runtime.c
           upload_asset lang/runtime/el_runtime.h el_runtime.h
+          upload_asset lang/runtime/engram_store.c engram_store.c
+          upload_asset lang/runtime/engram_store.h engram_store.h
 
           # SDK bundle and installer binary
           upload_asset dist/el-sdk-latest.tar.gz             el-sdk-latest.tar.gz

engram/.gitea/workflows/engram-release.yaml

@@ -49,6 +49,12 @@ jobs:
           echo "Downloading el_runtime.h..."
           curl -fsSL "${RELEASE_BASE}/el_runtime.h" -o /usr/local/lib/el/el_runtime.h
 
+          echo "Downloading engram_store.c..."
+          curl -fsSL "${RELEASE_BASE}/engram_store.c" -o /usr/local/lib/el/engram_store.c
+
+          echo "Downloading engram_store.h..."
+          curl -fsSL "${RELEASE_BASE}/engram_store.h" -o /usr/local/lib/el/engram_store.h
+
           echo "El SDK installed:"
           elc --version || true
 
@@ -67,6 +73,7 @@ jobs:
             -o dist/engram \
             dist/engram.c \
             /usr/local/lib/el/el_runtime.c \
+            /usr/local/lib/el/engram_store.c \
             -lcurl -lpthread
           echo "Linked dist/engram"
           ls -lh dist/engram