fix: move servicelinks and communities passes before dump

The passes were running after run_post_extraction() which includes
dump_and_persist_hashes(), causing a NULL hash table SEGV when the
GraphQL linker called cbm_gbuf_find_by_label on the already-dumped
graph buffer.

Now runs inside run_post_extraction(): after tests+githistory, before
predump passes and dump — where the graph buffer is still fully live.

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

Author: claude

src/pipeline/pipeline.c

@@ -740,6 +740,27 @@ static int run_post_extraction(cbm_pipeline_t *p, cbm_pipeline_ctx_t *ctx,
         return rc;
     }
 
+    /* Cross-service protocol linking (GraphQL, gRPC, Kafka, etc.) */
+    if (!check_cancel(p)) {
+        struct timespec t;
+        cbm_clock_gettime(CLOCK_MONOTONIC, &t);
+        int sl_rc = cbm_pipeline_pass_servicelinks(ctx);
+        if (sl_rc < 0) {
+            cbm_log_warn("pass.servicelinks.error", "rc", itoa_buf(sl_rc));
+        }
+        cbm_log_info("pass.timing", "pass", "servicelinks", "elapsed_ms",
+                     itoa_buf((int)elapsed_ms(t)));
+    }
+
+    /* Communities pass (Louvain clustering on service-link edges) */
+    if (!check_cancel(p)) {
+        struct timespec t;
+        cbm_clock_gettime(CLOCK_MONOTONIC, &t);
+        cbm_pipeline_pass_communities(ctx);
+        cbm_log_info("pass.timing", "pass", "communities", "elapsed_ms",
+                     itoa_buf((int)elapsed_ms(t)));
+    }
+
     CBM_PROF_START(t_predump);
     run_predump_passes(p, ctx);
     CBM_PROF_END("pipeline", "3_predump_passes_total", t_predump);
@@ -848,27 +869,6 @@ int cbm_pipeline_run(cbm_pipeline_t *p) {
         goto cleanup;
     }
 
-    /* Cross-service protocol linking (GraphQL, gRPC, Kafka, etc.) */
-    if (!check_cancel(p)) {
-        struct timespec t;
-        cbm_clock_gettime(CLOCK_MONOTONIC, &t);
-        int sl_rc = cbm_pipeline_pass_servicelinks(&ctx);
-        if (sl_rc < 0) {
-            cbm_log_warn("pass.servicelinks.error", "rc", itoa_buf(sl_rc));
-        }
-        cbm_log_info("pass.timing", "pass", "servicelinks", "elapsed_ms",
-                     itoa_buf((int)elapsed_ms(t)));
-    }
-
-    /* Communities pass (Louvain clustering on service-link edges) */
-    if (!check_cancel(p)) {
-        struct timespec t;
-        cbm_clock_gettime(CLOCK_MONOTONIC, &t);
-        cbm_pipeline_pass_communities(&ctx);
-        cbm_log_info("pass.timing", "pass", "communities", "elapsed_ms",
-                     itoa_buf((int)elapsed_ms(t)));
-    }
-
 
     cbm_log_info("pipeline.done", "nodes", itoa_buf(cbm_gbuf_node_count(p->gbuf)), "edges",
                  itoa_buf(cbm_gbuf_edge_count(p->gbuf)), "elapsed_ms",