ci: remove GitHub CI — native git.hanzo.ai + cd.hanzo.ai only

Inherited upstream workflow, repointed at a self-hosted ARC pool at fork time.
ARC is being decommissioned: CI runs inside git.hanzo.ai (Gitea Actions,
.hanzo/workflows) and delivery is cd.hanzo.ai reconciling the reviewed image
pin in hanzoai/universe. GitHub is a mirror and runs nothing.

This repo has no .hanzo/workflows today; it is a fork whose upstream CI we do
not rely on. If it needs a build, it gets a native pipeline — not an ARC pool.

.github/workflows/test-unit.yaml

@@ -1,93 +0,0 @@
-name: Test Unit
-
-on:
-  push:
-    branches:
-      - main
-    paths-ignore:
-      - 'docs/**'
-      - '**.md'
-      - 'script/gcg/**'
-  pull_request:
-    branches:
-      - '*'
-    paths-ignore:
-      - 'docs/**'
-      - '**.md'
-      - 'script/gcg/**'
-
-jobs:
-  generate-packages:
-    name: List Go Packages
-    runs-on: hanzo-build-linux-amd64
-    timeout-minutes: 15
-    outputs:
-      matrix: ${{ steps.set-matrix.outputs.matrix }}
-    steps:
-      - name: Check out code
-        uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
-        with:
-          fetch-depth: 0
-
-      - name: Set up Go
-        uses: actions/setup-go@7a3fe6cf4cb3a834922a1244abfce67bcef6a0c5 # v6.2.0
-        with:
-          go-version-file: '.go-version'
-          check-latest: true
-
-      - name: Generate matrix
-        id: set-matrix
-        run: |
-          matrix_output=$(go run ./internal/testsci/genmatrix.go)
-          echo "$matrix_output"
-          echo "$matrix_output" >> $GITHUB_OUTPUT
-
-  test-unit:
-    runs-on: hanzo-build-linux-amd64
-    timeout-minutes: 15
-    needs: generate-packages
-    strategy:
-      matrix:
-        package: ${{ fromJson(needs.generate-packages.outputs.matrix) }}
-
-    steps:
-      - name: Check out code
-        uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
-        with:
-          fetch-depth: 0
-
-      - name: Set up Go
-        uses: actions/setup-go@7a3fe6cf4cb3a834922a1244abfce67bcef6a0c5 # v6.2.0
-        with:
-          go-version-file: '.go-version'
-          check-latest: true
-
-      - name: Tests
-        run: |
-          go test -v -parallel 8 ${{ matrix.package.group }}
-
-  test-ui-unit:
-    runs-on: hanzo-build-linux-amd64
-    timeout-minutes: 15
-
-    steps:
-      - name: Check out code
-        uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
-        with:
-          fetch-depth: 0
-
-      - name: Setup node
-        uses: actions/setup-node@6044e13b5dc448c55e2357c09f80417699197238 # v6.2.0
-        with:
-          node-version-file: webui/.nvmrc
-
-      - name: Install pnpm
-        run: corepack enable && corepack prepare [email protected] --activate
-
-      - name: UI unit tests
-        working-directory: ./webui
-        env:
-          VITE_APP_BASE_API_URL: "/api"
-        run: |
-          pnpm install --frozen-lockfile
-          pnpm test:unit:ci