rsz: verify debug clamp messages in repair_design_outside_core test

Enable set_debug_level RSZ buffer_clamp 1 in the test so the
per-buffer clamp debug messages appear in the log and get validated
against the golden file.

Signed-off-by: minjukim55 <mkim@precisioninno.com>

Author: minjukim55

src/rsz/test/repair_design_outside_core.ok

@@ -11,6 +11,9 @@
 Iteration |   Area    | Resized | Buffers | Nets repaired | Remaining
 ---------------------------------------------------------------------
         0 |     +0.0% |       0 |       0 |             0 |        24
+[DEBUG RSZ-buffer_clamp] fanout1 clamped to core (51780, 1230) -> (51780, 22400)
+[DEBUG RSZ-buffer_clamp] fanout2 clamped to core (1780, 101230) -> (20140, 101230)
+[DEBUG RSZ-buffer_clamp] wire3 clamped to core (1780, 191480) -> (20140, 176400)
     final |     +7.5% |       0 |       4 |             1 |         0
 ---------------------------------------------------------------------
 [INFO RSZ-0035] Found 1 fanout violations.

src/rsz/test/repair_design_outside_core.tcl

@@ -61,6 +61,9 @@ source Nangate45/Nangate45.rc
 set_wire_rc -layer metal3
 estimate_parasitics -placement
 
+# Enable debug log so we can verify per-buffer clamp messages
+set_debug_level RSZ buffer_clamp 1
+
 # Force fanout and wire length violations to trigger buffer insertion
 set_max_fanout 5 [current_design]
 repair_design -max_wire_length 100