diff --git a/.kiro/specs/clusterconfig-schema-split/tasks.md b/.kiro/specs/clusterconfig-schema-split/tasks.md
index d0222b1..a0e7194 100644
--- a/.kiro/specs/clusterconfig-schema-split/tasks.md
+++ b/.kiro/specs/clusterconfig-schema-split/tasks.md
@@ -100,7 +100,7 @@
   - _Depends: 1.2_
   - _Boundary: CLI Tunables Component (main.c, myconf.h)_
 
-- [ ] 6.2 Wire the tunables into `init_controller_tunables()`
+- [x] 6.2 Wire the tunables into `init_controller_tunables()`
   - Read the new `myconf_t` fields in `init_controller_tunables()`, falling back to the existing hardcoded default for any field left at 0 (unset)
   - Observable: passing a tunable flag changes the corresponding controller tunable at startup; omitting all of them reproduces today's exact hardcoded values
   - _Requirements: 6.2_
diff --git a/src/controller/cluster.c b/src/controller/cluster.c
index 1ea462b..dbcdb5f 100644
--- a/src/controller/cluster.c
+++ b/src/controller/cluster.c
@@ -1014,8 +1014,13 @@ static void config_obj_killer(void* arg)
  * Called early in cluster_init_phase1 so the values are available throughout
  * the startup sequence (including pre-election and phase2).
  *
- * TODO: wire these to cluster_config fields once the config generation tool
- * supports jobmgr/workermgr/qmgr/resmgr/xstrings (@13–@17).
+ * Req 6.2: each tunable is sourced from its CLI-set myconf_t field
+ * (--jobmgr-nhash etc., populated in main.c) when nonzero; a field left at
+ * 0 (unset) falls back to the hardcoded default below, so omitting all
+ * tunable flags reproduces today's exact values. The cluster_config
+ * @13–@17 fields this TODO used to reference were removed entirely by
+ * clusterconfig-schema-split Requirement 2 (they were already dead) and
+ * will never be wired — CLI flags are the sole configuration path now.
  */
 /*
  * cluster_init_managers: allocate and initialize the manager subsystems.
@@ -1071,18 +1076,52 @@ static int cluster_init_managers(cluster_t *c)
 static void init_controller_tunables(cluster_t *c)
 {
     /* Jobs can be numerous; workers/queues/resources are typically smaller.
-     * TODO: replace with config-driven values once the config generation tool
-     * supports cluster_config fields @13–@17 (jobmgr/workermgr/qmgr/resmgr/xstrings). */
-    c->tunables.jobmgr_nhash    = 512;
-    c->tunables.jobmgr_delta    = 128;
-    c->tunables.workermgr_nhash = 128;
-    c->tunables.workermgr_delta = 32;
-    c->tunables.qmgr_nhash      = 128;
-    c->tunables.qmgr_delta      = 32;
-    c->tunables.resmgr_nhash    = 128;
-    c->tunables.resmgr_delta    = 32;
-    c->tunables.resmgr_inst     = 64;
-    c->tunables.xstrings_nhash  = 512;
+     * Req 6.2: same 0-sentinel idiom as myconf->vcpus (myapp.c) — a nonzero
+     * CLI-set myconf_t value overrides the hardcoded default; 0 (unset)
+     * reproduces today's exact value. */
+    myconf_t *myconf = c->myconf;
+
+    c->tunables.jobmgr_nhash    = (myconf->jobmgr_nhash > 0)
+                                       ? myconf->jobmgr_nhash : 512;
+    c->tunables.jobmgr_delta    = (myconf->jobmgr_delta > 0)
+                                       ? myconf->jobmgr_delta : 128;
+    c->tunables.workermgr_nhash = (myconf->workermgr_nhash > 0)
+                                       ? myconf->workermgr_nhash : 128;
+    c->tunables.workermgr_delta = (myconf->workermgr_delta > 0)
+                                       ? myconf->workermgr_delta : 32;
+    c->tunables.qmgr_nhash      = (myconf->qmgr_nhash > 0)
+                                       ? myconf->qmgr_nhash : 128;
+    c->tunables.qmgr_delta      = (myconf->qmgr_delta > 0)
+                                       ? myconf->qmgr_delta : 32;
+    c->tunables.resmgr_nhash    = (myconf->resmgr_nhash > 0)
+                                       ? myconf->resmgr_nhash : 128;
+    c->tunables.resmgr_delta    = (myconf->resmgr_delta > 0)
+                                       ? myconf->resmgr_delta : 32;
+    /* resmgr_inst_delta (myconf/CLI name) maps by MEANING, not by name, to
+     * tunables.resmgr_inst (runtime field name) — both are the same
+     * zarray_init() growth-delta for c->sharedinst (confirmed: zarray_init's
+     * 2nd parameter is literally named `delta` in zarray.c). Do not rename
+     * tunables.resmgr_inst itself — out of scope, other readers unverified. */
+    c->tunables.resmgr_inst     = (myconf->resmgr_inst_delta > 0)
+                                       ? myconf->resmgr_inst_delta : 64;
+    c->tunables.xstrings_nhash  = (myconf->xstrings_nhash > 0)
+                                       ? myconf->xstrings_nhash : 512;
+
+    /* myconf->xstrings_delta (CLI: --xstrings-delta, added in task 6.1) is
+     * intentionally NOT wired to any c->tunables field: xstring_table_init()
+     * (src/lib/xstring.c) takes only an nslots parameter, and its backing
+     * store (kvtab_type, src/lib/kv.c) has no delta/growth-step concept at
+     * all -- each bucket entry is calloc'd individually, unlike the
+     * xkvmgr_type-backed jobmgr/workermgr/qmgr/resmgr tables which do grow
+     * by a configurable delta. Adding a tunables.xstrings_delta field would
+     * be dead: nothing could ever read it. WARN so the flag isn't a silent
+     * no-op for an operator who sets it. */
+    if (myconf->xstrings_delta > 0) {
+        WARN("--xstrings-delta=%u has no effect: the xstrings table has no "
+             "growth-delta dimension (xstring_table_init() takes only "
+             "nslots); use --xstrings-nhash instead",
+             myconf->xstrings_delta);
+    }
 }
 
 int cluster_init_phase1(cluster_t* c)