Merge loops/host into architecture (-s ours): otel work superseded
loops/host's 3 post-split otel commits (route-order fix, JIT self-warm, auto-refresh dashboard) were INDEPENDENTLY superseded by architecture's parallel otel work, which has better implementations of each: the /:slug route fix, a /dev/tcp detached self-warm (vs loops/host's make-app warmup in the wrong JIT context), and a richer SPA-poll dashboard (p50/p95/p99 chart + waterfall + tooltips + child spans) vs a meta-refresh. Taking loops/host's versions would regress the live dashboard, so -s ours keeps architecture's tree and just joins the history to close the branch.
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