CI: fix resolve-versions to use curl+jq instead of npm view

catthehacker/ubuntu:act-latest ships Node/npm under /opt/acttoolcache/
with PATH updated only in /etc/environment. act_runner (nektos/act) does
not source /etc/environment — it reads the Docker image's ENV instructions
(inspectResult.Config.Env) which only contain DEBIAN_FRONTEND=noninteractive.
So npm is NOT on PATH and 'npm view ...' would have CI-failed on first run.

Fix: query the npm registry HTTP API directly with curl+jq, both of which
are already used extensively by this workflow (curl for Hub auth/manifest
inspect, jq for token parsing). The endpoint
  https://registry.npmjs.org/<pkg>/latest
returns JSON with a 'version' field — equivalent to 'npm view <pkg> version'
but with no toolchain dependency.

Verified locally: both URLs resolve correctly to 0.75.5 (pi) and 1.1.1 (omos).

Evidence: nektos/act pkg/container/docker_run.go reads imageEnv from
inspectResult.Config.Env, not /etc/environment. DefaultPathVariable() in
linux_container_environment_extensions.go returns a hardcoded path with no
/opt/acttoolcache in it.

.gitea/workflows/docker-publish-split.yml

@@ -123,12 +123,17 @@ jobs:
       pi_version: ${{ steps.resolve.outputs.pi_version }}
       omos_version: ${{ steps.resolve.outputs.omos_version }}
     steps:
-      - name: Resolve pi + omos versions from npm
+      - name: Resolve pi + omos versions from npm registry
         id: resolve
         run: |
           set -eu
-          PI_VERSION=$(npm view @earendil-works/pi-coding-agent version)
-          OMOS_VERSION=$(npm view oh-my-opencode-slim version)
+          # Query the npm registry directly via curl+jq rather than `npm view`.
+          # catthehacker/ubuntu:act-latest ships Node/npm under /opt/acttoolcache/
+          # and adds it to PATH only via /etc/environment — which act_runner never
+          # sources (it reads the Docker image's ENV instructions, not /etc/environment).
+          # curl and jq are both guaranteed present in every job in this workflow.
+          PI_VERSION=$(curl -sf "https://registry.npmjs.org/@earendil-works%2Fpi-coding-agent/latest" | jq -r '.version')
+          OMOS_VERSION=$(curl -sf "https://registry.npmjs.org/oh-my-opencode-slim/latest" | jq -r '.version')
           echo "pi_version=${PI_VERSION}"     >> "$GITHUB_OUTPUT"
           echo "omos_version=${OMOS_VERSION}" >> "$GITHUB_OUTPUT"
           echo "Resolved PI_VERSION=${PI_VERSION}, OMOS_VERSION=${OMOS_VERSION}"