ADR-0032 + intra_* opposite directions in IPCQ install

Add intra_N/S/E/W to install.py _OPPOSITE_DIR table so the intra-cube
PE-to-PE namespace is symmetrical with intercube N/S/E/W. ADR-0032
documents the intercube allreduce algorithm (supersedes ADR-0029).
Refresh ADR-0024/0025/0029 cross-refs and update
test_intercube_sfr_config.py to cover the new intra_* mappings. Drop
the obsolete test_ccl_round_robin_recv.py (replaced by intercube tests).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/kernbench/ccl/install.py

@@ -221,6 +221,8 @@ def install_ipcq(
 
     _OPPOSITE_DIR = {
         "E": "W", "W": "E", "N": "S", "S": "N",
+        "intra_E": "intra_W", "intra_W": "intra_E",
+        "intra_N": "intra_S", "intra_S": "intra_N",
         "global_E": "global_W", "global_W": "global_E",
         "global_N": "global_S", "global_S": "global_N",
     }