restore: re-apply UDMA P2P perf demo (#40)#45
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This reverts commit a02b856.
Introduce a new memory_consume transport that copies payload through the IPC peer window and synchronizes via SyncCollectives outer flags, so both ranks stay active. Wire the host launch path, perf config helpers (P2PTransportUsesIpc / P2PTransportBothRanksActive), sweep defaults, unit tests, and a source-guard test.
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Summary
This PR restores the UDMA P2P perf demo that was merged in #40 and subsequently reverted in #44.
Re-applies the demo with the following changes:
Reverts the revert commit a02b856 (PR #44) so the demo is back on main.
Test
tests/udma/run_tests.shtests/udma/demo/run_tilexr_udma_p2p_perf.sh