Fix run_recipe endpoint to use content-addressable run_id

The run_recipe endpoint was still using uuid.uuid4() instead of
compute_run_id(). Now it:
- Computes deterministic run_id from inputs + recipe
- Checks L1 cache before running
- Checks L2 and pulls from IPFS if needed
- Only runs Celery if output not found

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

server.py

@@ -1534,8 +1534,6 @@ async def run_recipe(recipe_id: str, request: RecipeRunRequest, ctx: UserContext
     # Build DAG from recipe
     dag = build_dag_from_recipe(yaml_config, request.inputs, recipe)
 
-    # Create run
-    run_id = str(uuid.uuid4())
     actor_id = ctx.actor_id
 
     # Collect all input hashes
@@ -1544,12 +1542,71 @@ async def run_recipe(recipe_id: str, request: RecipeRunRequest, ctx: UserContext
         if fixed.content_hash:
             all_inputs.append(fixed.content_hash)
 
+    # Compute content-addressable run_id
+    run_id = compute_run_id(all_inputs, f"recipe:{recipe.name}")
+    output_name = f"{recipe.name}-{run_id[:8]}"
+
+    # Check L1 cache first
+    cached_run = await database.get_run_cache(run_id)
+    if cached_run:
+        output_hash = cached_run["output_hash"]
+        if cache_manager.has_content(output_hash):
+            logger.info(f"run_recipe: Cache hit for run_id={run_id[:16]}...")
+            return RunStatus(
+                run_id=run_id,
+                status="completed",
+                recipe=f"recipe:{recipe.name}",
+                inputs=all_inputs,
+                output_name=output_name,
+                created_at=cached_run.get("created_at", datetime.now(timezone.utc).isoformat()),
+                completed_at=cached_run.get("created_at", datetime.now(timezone.utc).isoformat()),
+                output_hash=output_hash,
+                username=actor_id,
+                provenance_cid=cached_run.get("provenance_cid"),
+            )
+
+    # Check L2 if not in L1
+    l2_server = ctx.l2_server
+    try:
+        l2_resp = http_requests.get(f"{l2_server}/assets/by-run-id/{run_id}", timeout=10)
+        if l2_resp.status_code == 200:
+            l2_data = l2_resp.json()
+            output_hash = l2_data.get("output_hash")
+            ipfs_cid = l2_data.get("ipfs_cid")
+            if output_hash and ipfs_cid:
+                logger.info(f"run_recipe: Found on L2, pulling from IPFS")
+                import ipfs_client
+                legacy_dir = CACHE_DIR / "legacy"
+                legacy_dir.mkdir(parents=True, exist_ok=True)
+                recovery_path = legacy_dir / output_hash
+                if ipfs_client.get_file(ipfs_cid, str(recovery_path)):
+                    cache_manager._set_content_index(output_hash, output_hash)
+                    cache_manager._set_ipfs_index(output_hash, ipfs_cid)
+                    await database.save_run_cache(
+                        run_id=run_id, output_hash=output_hash,
+                        recipe=f"recipe:{recipe.name}", inputs=all_inputs,
+                        ipfs_cid=ipfs_cid, provenance_cid=l2_data.get("provenance_cid"),
+                        actor_id=actor_id,
+                    )
+                    return RunStatus(
+                        run_id=run_id, status="completed",
+                        recipe=f"recipe:{recipe.name}", inputs=all_inputs,
+                        output_name=output_name,
+                        created_at=datetime.now(timezone.utc).isoformat(),
+                        completed_at=datetime.now(timezone.utc).isoformat(),
+                        output_hash=output_hash, username=actor_id,
+                        provenance_cid=l2_data.get("provenance_cid"),
+                    )
+    except Exception as e:
+        logger.warning(f"run_recipe: L2 lookup failed: {e}")
+
+    # Not cached - run Celery
     run = RunStatus(
         run_id=run_id,
         status="pending",
         recipe=f"recipe:{recipe.name}",
         inputs=all_inputs,
-        output_name=f"{recipe.name}-{run_id[:8]}",
+        output_name=output_name,
         created_at=datetime.now(timezone.utc).isoformat(),
         username=actor_id
     )
@@ -3652,6 +3709,7 @@ def render_page(title: str, content: str, actor_id: Optional[str] = None, active
             <a href="/runs" class="pb-3 px-1 font-medium transition-colors {runs_active}">Runs</a>
             <a href="/recipes" class="pb-3 px-1 font-medium transition-colors {recipes_active}">Recipes</a>
             <a href="/media" class="pb-3 px-1 font-medium transition-colors {media_active}">Media</a>
+            <a href="/download/client" class="pb-3 px-1 font-medium transition-colors text-gray-400 hover:text-white ml-auto" title="Download CLI client">Download Client</a>
         </nav>
 
         <main>
@@ -3720,6 +3778,7 @@ def render_ui_html(actor_id: Optional[str] = None, tab: str = "runs") -> str:
             <a href="/runs" class="pb-3 px-1 font-medium transition-colors {runs_active}">Runs</a>
             <a href="/recipes" class="pb-3 px-1 font-medium transition-colors {recipes_active}">Recipes</a>
             <a href="/media" class="pb-3 px-1 font-medium transition-colors {media_active}">Media</a>
+            <a href="/download/client" class="pb-3 px-1 font-medium transition-colors text-gray-400 hover:text-white ml-auto" title="Download CLI client">Download Client</a>
         </nav>
 
         <div id="content" hx-get="{content_url}" hx-trigger="load" hx-swap="innerHTML">