WP-0004: ecosystem integration complete

Add Helix Forge correlation (HELIX_SESSION_UID env, metrics correlate),
artifact-store publish (metrics publish), activity-core ActivityDefinition
references, integration patterns docs, and canon/knowledge design artifacts.

tests/test_integration_patterns.py

@@ -0,0 +1,33 @@
+"""Smoke tests for WP-0004 integration artifacts."""
+
+from __future__ import annotations
+
+from pathlib import Path
+
+import yaml
+
+
+DEFINITIONS_DIR = (
+    Path(__file__).parent.parent / "docs" / "integrations" / "activity-definitions"
+)
+
+
+def test_activity_definitions_have_required_frontmatter():
+    files = list(DEFINITIONS_DIR.glob("*.md"))
+    assert len(files) == 3
+
+    for path in files:
+        text = path.read_text(encoding="utf-8")
+        assert text.startswith("---\n")
+        end = text.index("\n---\n", 4)
+        frontmatter = yaml.safe_load(text[4:end])
+        assert frontmatter["id"]
+        assert frontmatter["trigger"]["type"] in ("cron", "event")
+        assert frontmatter["owner"] == "kaizen-agentic"
+
+
+def test_integration_docs_exist():
+    root = Path(__file__).parent.parent / "docs"
+    assert (root / "INTEGRATION_PATTERNS.md").exists()
+    assert (root / "integrations" / "helix-forge-correlation.md").exists()
+    assert (root / "integrations" / "optimizer-artifact-manifest.md").exists()