[tamnd]

Part of #2.

What changes

• Add rupg-bench m1, the in-process driver of spec/22 §22.12. It links the rupg facade at the commit of pins.toml (238dd51, the head of tamnd/rupg after #130) and has four steps: empty, latency, throughput and recovery. A test checks that the commit in Cargo.toml and the commit in pins.toml are the same.
• recovery starts rupg-bench m1-fill in a child process. The child updates 256 rows of 2,000 bytes in each commit until 1 GiB of values is in the log, and it exits with no close. The driver then drops the file from the page cache with dd iflag=nocache and times the open that replays the log. The report has log_bytes from rupg check.
• The report goes to reports/<date>/<commit>-<machine>-m1.md with a JSON file. The commit in the name is the rupg commit.
• The README has a section on m1.
• Smoke reports of server1 and server2 in reports/2026-10-07/. They are smoke runs and not baselines.

Test

srvtest passed on server1 at the head of this branch: fmt, clippy, cargo deny and 71 tests. Both runs were on 2026-10-07 at about 19:35 UTC, at rupg 238dd51.

	server1	server2
cores	4	6
empty file	80.05 MiB, 300 KiB allocated	80.05 MiB, 300 KiB allocated
commit latency p50	3098 us	2029 us
commit latency p99	35891 us	6219 us
commits per second, one writer per core	541	1241
open after 1 GiB of log, cold cache	9.40 s	4.09 s

At rupg aed939c, before #129 and #130, the open on server1 took 15.33 s.

Notes

• Both servers are shared and have no local NVMe, so the latency and throughput numbers follow the fdatasync time of the disk and say nothing about a reference machine. The driver does not print the fdatasync p50 of the device yet, so the latency line of M1: Storage and commit floors #2 stays open.
• The empty file is sparse: 80 MiB of length, and 300 KiB allocated. The budget of spec/17 §17.10 is 256 KiB. I report the allocated bytes in rupg#2, where the budget is tracked.
• gpc is not available, so the throughput line of M1: Storage and commit floors #2 stays open, and so does the PostgreSQL 18.6 commit curve next to it.