the measured graph moves onto the wave

[Sunrisepeak]

What moves

tests/openkal/pins.toml → openkal-llvm-runtime 0.13.0, registered and published in the preceding PR (#449). It pins openkal-musl 0.18.0 → openkal-linux 0.15.0, openkal-windows 0.10.0, openkal-macos 0.12.0 — the first graph in which all three implementations declare which interfaces of the layer they provide.

Also: mcpp → 2026.9.20.1 in pins.toml and in openkal-compat.yml (that workflow fails the run when the two disagree), MCPP_VERSION → 2026.9.20.1 in validate.yml, and latest_mcpp → 2026.9.20.1.

Why the graph pin matters to a measurement

Below it, a members requires-interfaceswas answered on two implementations and **silently unanswered on the third** — openkal-macos carried no array, and mcpp treats a provider that states nothing as stating nothing, not as providing nothing. A measurement taken there recordsbuilds` for a member whose requirement nothing checked.

min_mcpp does not move

Both new manifest keys are top-level tables, which an older engine ignores (it refuses an unknown member of a table it knows — that asymmetry is why both are shaped this way). Measured against the published 2026.9.18.3 archive: the absence table was first written as [c-abi].absent and that binary refused openkal-musl`s whole manifest on every target; top-level, the same binary builds it. All 231 descriptors parse under 2026.9.18.3, so the descriptor grammar this floor governs is unchanged.

The baseline this run will be compared against

From the preceding run on the old graph — 60 member×target results: 50 pass (47 of them runs (posix)), 10 fail:

count	cause	members
4	windows.h, reached through the borrowed __CYGWIN__	archive, sqlite3, mimalloc, c-ares
2	__cxa_thread_atexit	spdlog, doctest
2	linux/ uapi header	curl, cmp-module
1	arc4random_buf	expat
1	curl_off_t	curl

The first two groups are known and recorded (design §5.3 and 2026-09-20-cxa-thread-atexit-finding.md). This move is what makes the next run comparable against them.

Verification

231 descriptors, 2026.9.18.3	parse
231 descriptors, 2026.9.20.1	parse
compat.py selftest	5 passed, 0 failed
pins.toml mcpp vs openkal-compat.yml	agree
0.13.0 resolvable at the consumer	mcpp search on the published index lists it