Measure a link at rest: 132 bytes against a QUIC connection's 38,106 (094)

M1 of design 011. A Pure node allows 1,000 to 1,000,000 senders; each
sends one order and, once told it is stored, rests. At rest a link costs
the node 132 bytes (the sender allowed, 73; its number heard, about 60)
and no transport state; with a million the node runs in 139 MB. A quinn
0.11 service holding the same exchange's clients connected at rest costs
38,106 bytes a connection: 289 times as much, past the design's 1/100.
A link at rest takes its next record in 0.56 ms to stored, one X25519 on
the node included; a new QUIC connection takes 1.06 ms and 2.8 times the
receiver's CPU, without storing.

research/experiments/019-idle-links: links.c, many senders written from
serve/link.h's packet format alone (a second implementation), and the
quinn service and clients (quic/, built offline); run.py makes both
measurements.

1 files changed, 634 insertions, 0 deletions

diff --git a/research/experiments/019-idle-links/quic/Cargo.lock b/research/experiments/019-idle-links/quic/Cargo.lock
new file mode 100644
index 0000000..f31be94
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