testmgr: enroll the C cross-conformance matrix + lua-cross in the full tier

• Type: feature (test infra). Track T.
• Filed: 2026-07-08 by Track C while landing [[feature-c-cross-target-feature-coverage]] (T owns tools/testmgr.py, so filed rather than edited cross-lane).

What landed (Track C side)

• make test-c-conformance-{i386,aarch64,arm32,riscv32} — the 220-program c-testsuite battery per cross target under QEMU (tools/run_c_conformance.sh --target <arch>, per-target skip files test/c-conformance/pxx.skip.<arch>). All four green as of e0f9f5e4+. ~1-3 min each serially; the runner still supports --shard I/N for fan-out (works combined with --target).
• make test-lua-cross — lua runner + script set on all four targets (green).

Ask

Add these to the full tier in tools/testmgr.py (classify: conformance / qemu / corpus as appropriate; the cross-conformance jobs are qemu-per-program so probably conformance class with shard fan-out like the native battery). Keeps the watcher catching per-target C regressions — the matrix found 3 real backend gaps on day one (00120/00174-175/00189 tickets).

Done (Track T, 2026-07-12)

Enrolled in the full tier: test-c-conformance-{i386,aarch64,arm32,riscv32} (each fanned out over the runner's 6 shards, like the native battery) and test-lua-cross. +25 jobs, full tier 1157 -> 1182.

The matrix is RED on arrival — and these are real, confirmed independently of testmgr (plain make test-c-conformance-i386 fails the same way), so the ticket's "all four green as of e0f9f5e4+" has regressed since:

• 00204.c — struct-by-value/varargs truncated on every 32-bit target (i386/arm32/riscv32), fine on x86-64+aarch64 → [[bug-c-struct-byval-varargs-32bit]] (Track A, ABI)
• 00219.c — _Generic picks int where the operand is long, again 32-bit only (int and long are both 32 bits there, so type identity collapses) → [[bug-c-generic-long-vs-int-on-32bit]] (Track C)
• 00200.c — left-shift promotion, aarch64 only → [[bug-c-lshift-promotion-aarch64]] (Track C/A)

So the watcher's full tier will report RED until those land. That is the honest state and the whole point of enrolling — the matrix "found 3 real backend gaps on day one" per this ticket, and it just did so again. Nothing gates dev pushes on full (quick + self-host is the push bar), and tstate is the truth.

Log

• 2026-07-12 — resolved, commit 6ec9cefb.