ADR-0023 D9.7+: charge PE↔bank fabric hop for SRAM/HBM IPCQ slots

Cube SRAM and HBM live on the cube NoC behind router-attached links
(sram_to_router_bw_gbs=128, hbm_to_router_bw_gbs=256). Previously the
slot-IO model treated them as if they were per-PE local, so the
buffer_kind sweep showed TCM ≈ SRAM at 64 KB / PE.

pe_ipcq._handle_recv and pe_dma._handle_ipcq_inbound now charge a
PE→bank compute_drain_ns on top of the intrinsic slot-IO for SRAM/HBM.
TCM stays free of this hop. Adds an internal IpcqRecvCmd.consume field
that gates the recv-side hop+slot-IO charges (used by a follow-up
diagnostic API; default True keeps current behavior).

Post-fix at 64 KB / PE: TCM 12.0 µs < HBM 21.4 µs < SRAM 24.3 µs.
SRAM is slowest because its 128 GB/s bank link is the narrowest in
the system — narrower than HBM's 256 GB/s. The existing ordering test
is rewritten from tcm<sram<hbm to tcm<hbm<sram and a new
test_ipcq_buffer_kind_locations adds 3 invariants on the gap.

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

src/kernbench/common/ipcq_types.py

@@ -135,6 +135,13 @@ class IpcqRecvCmd:
         "return_slot" — return slot address as-is (default, zero-copy).
                         Kernel uses the slot memory directly.
         "copy_to_dst" — copy slot data to dst_addr, then return.
+
+    ``consume`` (DIAGNOSTIC ONLY): when False, recv still blocks until the
+    payload lands in the slot, but skips the slot-read latency charge
+    (slot-IO + PE↔bank fabric drain for SRAM/HBM tiers). This exists
+    solely so the pe2pe overview plot can compare apples-to-apples
+    against tl.store (a one-sided write that pays no read on DST). Real
+    kernels always need the data they receive — leave this True.
     """
 
     direction: str | None        # None → round-robin (weak fairness, D4)
@@ -146,6 +153,7 @@ class IpcqRecvCmd:
     dst_space: str = ""          # used only when recv_mode == "copy_to_dst"
     blocking: bool = True
     data_op: bool = True
+    consume: bool = True         # DIAGNOSTIC: see docstring
 
 
 # ── D12: IpcqDmaToken (PE_IPCQ → PE_DMA, vc_comm) ───────────────────