ci: drop the two dead cells the live run exposed; fix the sdk generator pin

macos/x86_64: macos-13 runner label retired — queued forever, no hosted
Intel Mac remains. windows/x86_64: lem is not Windows-portable
(syscall.Kill + raw-fd reads outside constraints — three live compile
errors); the cell returns when a portability campaign lands, not
before. sdk: @openapitools/openapi-generator-cli npm wrapper is 2.x
(2.40.0) — 7.22.0 conflated it with the Java generator version it
manages; ETARGET on every run.

Live receipts: CI (portable suite) PASSED on this branch; cpu cells
macos/aarch64 + linux/x86_64 + linux/aarch64 built green; metal gate
skipped dormant as designed.

Co-Authored-By: Virgil <virgil@lethean.io>

Author: Snider

.github/workflows/build.yml

@@ -37,11 +37,15 @@ jobs:
       fail-fast: false
       matrix:
         include:
+          # Dropped cells, proven by live runs 2026-07-22 (docs/release-artifacts.md):
+          #  - macos/x86_64: the macos-13 runner label is retired (queued forever) —
+          #    no hosted Intel Mac remains; revisit only on real demand.
+          #  - windows/x86_64: lem's code is not Windows-portable yet (unix-only
+          #    syscall.Kill + raw-fd reads outside build constraints) — a code
+          #    campaign, not a CI matrix entry; restore the cell when it compiles.
           - { runner: macos-latest,     os_name: macos,   arch: aarch64, exe: "" }
-          - { runner: macos-13,         os_name: macos,   arch: x86_64,  exe: "" }
           - { runner: ubuntu-latest,    os_name: linux,   arch: x86_64,  exe: "" }
           - { runner: ubuntu-24.04-arm, os_name: linux,   arch: aarch64, exe: "" }
-          - { runner: windows-latest,   os_name: windows, arch: x86_64,  exe: ".exe" }
     steps:
       - uses: actions/checkout@v4
         # cpu build needs neither external/mlx (metal) nor the ROCm sources.
@@ -182,7 +186,7 @@ jobs:
           java-version: "21"
       - name: Install generators
         run: |
-          npm install -g @openapitools/openapi-generator-cli@7.22.0
+          npm install -g @openapitools/openapi-generator-cli@2.40.0   # npm wrapper is 2.x; it manages the 7.x Java generator
           go install github.com/go-task/task/v3/cmd/task@latest
       - name: Generate SDKs (lem spec -> OpenAPI 3.1 -> typed clients)
         run: task sdk

docs/release-artifacts.md

@@ -32,15 +32,19 @@ into the Native zip as `lem` and into the Driver zip as `lem-{backend}`. No doub
 |----|------|---------|----------|-----|
 | macos | aarch64 | metal | self-hosted macOS 26 lane (dormant) / manual | `task metallib && task build:embed` |
 | macos | aarch64 | cpu | **GitHub** `macos-latest` | native cgo `go build ./cli` |
-| macos | x86_64 | cpu | **GitHub** `macos-13` | native cgo |
 | linux | x86_64 | amd | **GitLab** homelab | `make lem-amd` |
 | linux | x86_64 | cuda | **GitLab** homelab | `make lem-cuda` |
 | linux | x86_64 | cpu | **GitHub** `ubuntu-latest` (rolling) · **GitLab** `make lem-cpu-x86` (tag) | native cgo |
 | linux | aarch64 | cpu | **GitHub** `ubuntu-24.04-arm` (rolling) · **GitLab** `make lem-cpu-aarch64` (tag) | native cgo |
-| windows | x86_64 | cpu | **GitHub** `windows-latest` | native cgo (mingw) |
 
 ### Excluded cells (and why)
 
+- **cpu · macos/x86_64** — the `macos-13` runner label is retired (live-proven 2026-07-22:
+  queued forever); GitHub hosts no Intel Mac any more. Revisit only on real demand.
+- **cpu · windows/x86_64** — lem's code is not Windows-portable yet: unix-only
+  `syscall.Kill` + raw-fd reads sit outside build constraints (live-proven 2026-07-22,
+  three compile errors). Restoring the cell is a code-portability campaign, not a
+  matrix entry.
 - **cpu · windows/aarch64** — `duckdb-go-bindings` ships no `windows-arm64` prebuilt lib, so
   the binary cannot link. Not a cell.
 - **metal · anything but macos/aarch64** — Metal is Apple-GPU only.