fix(merge): drop duplicate restart-cap test hook after folding step-1 fixes into step 2

Merging sync/upstream-step1 (which defines cbm_index_restart_cap_for_testing)
into step 2 (which had added the same hook independently) left two
definitions in src/daemon/application.c and two declarations in
application.h. Keep step 1's copy. Production build and test-runner compile
are clean.

Author: ngallodev

src/daemon/application.c

@@ -1816,10 +1816,6 @@ bool cbm_daemon_application_index_args_equal_for_test(const char *left, const ch
     return application_index_args_equal(left, right);
 }
 
-int cbm_index_restart_cap_for_testing(void) {
-    return application_max_restarts();
-}
-
 /* Caller holds application->mutex. Keeping watcher ownership validation and
  * this admission in the same critical section closes the unwatch race. */
 static cbm_daemon_application_job_t *application_job_subscribe_locked(

src/daemon/application.h

@@ -164,7 +164,4 @@ size_t cbm_daemon_application_job_subscribers(cbm_daemon_application_t *applicat
 size_t cbm_daemon_application_physical_job_limit(cbm_daemon_application_t *application);
 size_t cbm_daemon_application_worker_memory_budget_bytes(cbm_daemon_application_t *application);
 
-/* Recovery-round cap read from CBM_INDEX_MAX_RESTARTS (zero means none). */
-int cbm_index_restart_cap_for_testing(void);
-
 #endif /* CBM_DAEMON_APPLICATION_H */