feat: test-generation + issue/PR summary via slash commands (/gen-tests, /summarize)

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

.gitea/workflows/reusable-commands.yml

@@ -0,0 +1,43 @@
+# GLOBALE, wiederverwendbare Slash-Commands (Feature D + E).
+# Wird vom Caller bei einem issue_comment ausgelöst:
+#   /gen-tests   → KI-Test-Vorschläge für den PR
+#   /summarize   → KI-Zusammenfassung des Issue-/PR-Threads
+#
+# Aufruf (siehe workflows/caller.example.yml):
+#   commands:
+#     if: github.event_name == 'issue_comment' && ...
+#     uses: user2595/ci-ai/.gitea/workflows/reusable-commands.yml@main
+#     secrets: inherit
+name: ci-ai · commands (reusable)
+
+on:
+  workflow_call:
+    secrets:
+      ANTHROPIC_API_KEY:
+        required: false
+
+jobs:
+  command:
+    runs-on: eulernest
+    container:
+      image: python:3.12-slim
+      options: "--memory=512m --memory-swap=768m"
+    env:
+      AI_PROVIDER: anthropic
+      AI_MODEL: claude-3-5-haiku-latest
+      ANTHROPIC_API_KEY: ${{ secrets.ANTHROPIC_API_KEY }}
+      GITEA_TOKEN: ${{ github.token }}
+      GITEA_API: https://git.eulernest.eu/api/v1
+    steps:
+      - name: Tooling + ci-ai (anon)
+        run: |
+          apt-get update -qq && apt-get install -y -qq --no-install-recommends git ca-certificates
+          git clone --depth 1 https://git.eulernest.eu/user2595/ci-ai.git /opt/ci-ai
+
+      - name: /gen-tests
+        if: startsWith(github.event.comment.body, '/gen-tests')
+        run: python /opt/ci-ai/scripts/ai_tests.py
+
+      - name: /summarize
+        if: startsWith(github.event.comment.body, '/summarize')
+        run: python /opt/ci-ai/scripts/ai_summary.py