feat: enhance provenance with infrastructure, actor ID, and commit tracking

- Add infrastructure field to RunStatus model
- Store infrastructure (software/hardware) from task result
- Format username as ActivityPub actor ID (@user@domain)
- Display owner, effects commit, and infrastructure in UI provenance section
- Add artdag commit tracking for identity effect
- Include infrastructure in raw JSON provenance

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

tasks.py

@@ -17,6 +17,7 @@ from celery_app import app
 
 # Add effects to path (use env var in Docker, fallback to home dir locally)
 EFFECTS_PATH = Path(os.environ.get("EFFECTS_PATH", str(Path.home() / "artdag-effects")))
+ARTDAG_PATH = Path(os.environ.get("ARTDAG_PATH", str(Path.home() / "art" / "artdag")))
 
 
 def get_effects_commit() -> str:
@@ -35,6 +36,22 @@ def get_effects_commit() -> str:
     return "unknown"
 
 
+def get_artdag_commit() -> str:
+    """Get current git commit hash of artdag repo."""
+    try:
+        result = subprocess.run(
+            ["git", "rev-parse", "HEAD"],
+            cwd=ARTDAG_PATH,
+            capture_output=True,
+            text=True
+        )
+        if result.returncode == 0:
+            return result.stdout.strip()
+    except Exception:
+        pass
+    return "unknown"
+
+
 sys.path.insert(0, str(EFFECTS_PATH / "dog"))
 
 
@@ -128,11 +145,13 @@ def render_effect(self, input_hash: str, effect_name: str, output_name: str) ->
     # Build effect info based on source
     if effect_name == "identity":
         # Identity is from artdag package on GitHub
+        artdag_commit = get_artdag_commit()
         effect_info = {
             "name": f"effect:{effect_name}",
             "content_hash": REGISTRY[f"effect:{effect_name}"]["hash"],
             "repo": "github",
-            "repo_url": "https://github.com/gilesbradshaw/art-dag/blob/main/artdag/nodes/effect.py"
+            "repo_commit": artdag_commit,
+            "repo_url": f"https://github.com/gilesbradshaw/art-dag/blob/{artdag_commit}/artdag/nodes/effect.py"
         }
     else:
         # Other effects from rose-ash effects repo