ci(freebsd): build the headless binary in the FreeBSD VM

The first proof run failed in both FreeBSD legs at `npm ci`: the UI
dependency tree pulls in onnxruntime-node, which publishes builds for
win32, darwin and linux only, so npm stops with EBADPLATFORM before the
frontend is built. The VM boot, the pkg prepare step, the gmake detection
and the source sync all worked.

The job now builds the headless binary (scripts/build.sh without
--with-ui) and drops node22/npm-node22 from the prepare step. That still
proves the C core builds and starts on FreeBSD; the UI bundle is
platform-independent JavaScript and is built on every other leg. The
aarch64 comment now says what is actually unproven.

Signed-off-by: Martin Vogel <martin.vogel.tech@gmail.com>

.github/workflows/freebsd.yml

@@ -1,6 +1,9 @@
-# FreeBSD build, INFORMATIONAL ONLY. Builds the UI-embedded binary (the one
-# every platform ships) inside a FreeBSD VM with the canonical scripts/build.sh,
-# then checks that the binary starts (--version).
+# FreeBSD build, INFORMATIONAL ONLY. Builds the headless binary (the C core,
+# no embedded UI) inside a FreeBSD VM with the canonical scripts/build.sh,
+# then checks that the binary starts (--version). The UI build is not run here:
+# its npm dependency tree pulls in onnxruntime-node, which publishes no FreeBSD
+# build, so `npm ci` stops with EBADPLATFORM. The UI bundle itself is
+# platform-independent JavaScript and is built on every other leg.
 #
 # NON-GATING: workflow_dispatch only. This workflow is not part of the ci-ok
 # aggregate and is not called by release.yml or dry-run.yml, so a FreeBSD red
@@ -26,14 +29,10 @@ jobs:
         release: ['15.1', '14.4']
         arch: ['x86_64']
         # arch: ['x86_64', 'aarch64']
-        # aarch64 is disabled for now: lightningcss (a native Rust dependency
-        # of the Vite/CSS build) publishes no prebuilt binary for freebsd-arm64,
-        # so `npm run build` fails with "Cannot find module
-        # '../lightningcss.freebsd-arm64.node'". That is a gap in the package's
-        # platform coverage, not something fixable on our side without
-        # vendoring a Rust build of it. Re-enable once lightningcss ships that
-        # target, or once the frontend build runs natively on a Linux host
-        # instead of inside the FreeBSD VM.
+        # aarch64 is disabled for now: it has not been proven with this
+        # workflow. Its earlier blocker was the frontend build (lightningcss
+        # publishes no freebsd-arm64 binary), which this headless job no
+        # longer runs. Re-enable after a green aarch64 proof run.
         include:
           - arch: x86_64
             sync: rsync
@@ -62,8 +61,8 @@ jobs:
           cpu: 4
           prepare: |
             pkg update -f
-            pkg install -y gmake sqlite3 pkgconf node22 npm-node22 bash
+            pkg install -y gmake sqlite3 pkgconf bash
             which python3 >/dev/null 2>&1 || ln -sf $(which python3.15 python3.14 python3.13 python3.12 python3.11 python3.10 2>/dev/null | head -n 1) /usr/local/bin/python3
           run: |
-            scripts/build.sh --with-ui CC=clang CXX=clang++
+            scripts/build.sh CC=clang CXX=clang++
             build/c/codebase-memory-mcp --version