Test remote latency under memory instrumentation

[lawrencecchen]

Summary

• inject a memory-instrumentation workload profile into the bidirectional interactive latency test
• preserve transport owners, epoch fences, payload digests, and the unchanged final watchdog
• keep the full 64 MiB and latency bounds as the default profile

Evidence

• red: PR9952 hosted run 31551446482 reached the final 90-second watchdog under Valgrind after making progress, with zero Valgrind errors
• static: direct rustfmt and diff checks passed
• local xhigh review: clean, 0.94
• local compile/tests: not run by instruction

Ledger effect: 0

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Summary by cubic

Add a memory-instrumented workload profile to the bidirectional interactive latency e2e test, selectable via CMUX_TEST_MEMORY_INSTRUMENTATION, so we can run under Valgrind without flakiness while keeping the default 64 MiB profile unchanged.

• New Features
  • Introduced a Workload profile to parameterize bulk size, echo count, and latency checks.
  • Default workload: 64 MiB, 256 echoes, enforces p95/p99 bounds.
  • Memory-instrumented workload: 4 MiB, 32 echoes, skips p95/p99 checks; keeps both directions, receiver fences, payload digests, and the 90s watchdog.
  • Enable by setting CMUX_TEST_MEMORY_INSTRUMENTATION=1; other values panic.

^{Written for commit b65e8c9. Summary will update on new commits.}

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