feat: complete route session baseline benchmark

.scratch/distributed-inference-performance/issues/01-baseline-profiling-harness.md

@@ -1,4 +1,4 @@
-Status: ready-for-agent
+Status: done (2026-07-14)
 
 # 01 — Baseline and profiling harness
 
@@ -12,16 +12,15 @@ sizes and connection counts without requiring a real model or external host.
 
 ## Acceptance criteria
 
-- [ ] The harness runs a fixed prompt and fixed generated-token count through a
+- [x] The harness runs a fixed prompt and fixed generated-token count through a
   two-node route in direct and relay modes.
-- [ ] It reports p50/p95 per-token latency, per-hop latency, payload bytes,
+- [x] It reports p50/p95 per-token latency, per-hop latency, payload bytes,
   compression ratio, connection attempts, and queue wait.
-- [ ] It distinguishes prefill from decode and cached from stateless mode.
-- [ ] It emits machine-readable JSON suitable for CI artifacts and a concise
+- [x] It distinguishes prefill from decode and cached from stateless mode.
+- [x] It emits machine-readable JSON suitable for CI artifacts and a concise
   human-readable summary.
-- [ ] A test fixture can assert connection attempts and output token identity.
+- [x] A test fixture can assert connection attempts and output token identity.
 
 ## Blocked by
 
-None - can start immediately.
-
+None - completed. Verified with `PYTHONPATH=packages/node pytest -q tests/test_route_session_benchmark.py` (7 passed).