refactor: remove require_ollama() predicate — redundant with backend marker

The ollama backend marker + conftest auto-skip already handles Ollama
availability. No other backend has a dedicated predicate — consistent
to let the marker system handle it.

Author: planetf1

.agents/skills/audit-markers/SKILL.md

@@ -415,13 +415,13 @@ the explicit size.
 |---------|--------------------|--------------------|
 | `LocalHFBackend` | Yes | `require_gpu(min_vram_gb=N)` |
 | `LocalVLLMBackend` | Yes | `require_gpu(min_vram_gb=N)` |
-| `OllamaModelBackend` | Managed by Ollama | `require_ollama()` only |
+| `OllamaModelBackend` | Managed by Ollama | None — `ollama` backend marker + conftest auto-skip handles availability |
 | `OpenAIBackend` (real API) | No | No GPU gate |
-| `OpenAIBackend` → Ollama `/v1` | Managed by Ollama | `require_ollama()` only |
+| `OpenAIBackend` → Ollama `/v1` | Managed by Ollama | None — `ollama` backend marker handles it |
 | `WatsonxAIBackend` / `LiteLLMBackend` / Cloud | No | No GPU gate |
 
 **Key rule:** Ollama manages its own GPU memory. Tests using Ollama backends
-should use `require_ollama()`, NOT `require_gpu()`.
+should use the `ollama` backend marker only, NOT `require_gpu()`.
 
 #### Compute VRAM estimate
 
@@ -497,7 +497,6 @@ Read `test/predicates.py` for the available predicates. Expected patterns:
 | `require_api_key("OPENAI_API_KEY")` | Specific API credentials |
 | `require_api_key("WATSONX_API_KEY", "WATSONX_URL", "WATSONX_PROJECT_ID")` | Multiple credentials |
 | `require_package("cpex.framework")` | Optional dependency |
-| `require_ollama()` | Running Ollama server |
 | `require_python((3, 11))` | Minimum Python version |
 
 Typical combinations for backends:
@@ -725,4 +724,4 @@ flag as a blocker, don't silently re-add:
   `pyproject.toml` and `test/MARKERS_GUIDE.md` must stay in sync manually.
 - **Resource predicates:** `test/predicates.py` provides `require_gpu`,
   `require_ram`, `require_api_key`, `require_package`,
-  `require_ollama`, `require_python`.
+  `require_python`.

test/MARKERS_GUIDE.md

@@ -155,7 +155,6 @@ from test.predicates import require_gpu, require_api_key
 | `require_ram(min_gb=N)` | N GB+ system RAM (genuinely RAM-bound tests only) |
 | `require_api_key("ENV_VAR")` | Specific API credentials |
 | `require_package("pkg")` | Optional dependency |
-| `require_ollama()` | Running Ollama server |
 | `require_python((3, 11))` | Minimum Python version |
 
 ### Typical combinations

test/predicates.py

@@ -179,29 +179,6 @@ def test_plugin_registration(): ...
     return pytest.mark.skipif(not available, reason=f"{package} not installed")
 
 
-# ---------------------------------------------------------------------------
-# Service reachability
-# ---------------------------------------------------------------------------
-
-
-def require_ollama(*, host: str = "localhost", port: int = 11434):
-    """Skip unless Ollama is reachable on the given host/port."""
-    import socket
-
-    try:
-        sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
-        sock.settimeout(1)
-        result = sock.connect_ex((host, port))
-        sock.close()
-        reachable = result == 0
-    except Exception:
-        reachable = False
-
-    return pytest.mark.skipif(
-        not reachable, reason=f"Ollama not available at {host}:{port}"
-    )
-
-
 # ---------------------------------------------------------------------------
 # Python version
 # ---------------------------------------------------------------------------