feat(pipeline): emit CALLS edges for decorator applications

Decorators previously only created DECORATES edges. A @login_required
decorator was invisible to "find all references" queries because those
look for CALLS and USAGE edges. Now resolve_decorator emits both
DECORATES and CALLS edges.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: map588

src/pipeline/pass_semantic.c

@@ -321,6 +321,9 @@ static void resolve_decorator(cbm_pipeline_ctx_t *ctx, const cbm_gbuf_node_t *no
         char props[CBM_SZ_256];
         snprintf(props, sizeof(props), "{\"decorator\":\"%s\"}", decorator);
         cbm_gbuf_insert_edge(ctx->gbuf, node->id, dec->id, "DECORATES", props);
+        /* Also emit CALLS edge so decorator appears in "find all references" queries */
+        cbm_gbuf_insert_edge(ctx->gbuf, node->id, dec->id, "CALLS",
+                             "{\"kind\":\"decorator\"}");
         (*count)++;
     }
 }