Update extensions and documentation for LLM integration and CLI enhancements

- Added support for a new extension, `swarm-assistent`, in `extensions.example.yaml` with a requirement for `ollama`.
- Enhanced the README.md to clarify the setup process and provide a quick start guide for using extensions.
- Updated documentation in `llm.md` to reflect the opt-in nature of LLM support and provide clearer instructions for enabling it.
- Improved the `autocomplete.md` to detail the automatic setup of word lists during the initial launch.
- Revised `cli.md` to include new commands and options related to LLM runtime handling and extension management.
- Enhanced the `spike-notes.md` to guide users through the first live run with a focus on LLM integration.

tests/test_manifests.py

@@ -1,6 +1,9 @@
 from pathlib import Path
 
-from gpu_rent.manifests import parse_extensions, parse_models
+import pytest
+
+from gpu_rent.errors import ConfigError
+from gpu_rent.manifests import parse_extensions, parse_models, repo_matches_runtime
 
 
 def test_models_skips_version_zero(tmp_path: Path):
@@ -30,3 +33,49 @@ def test_extensions_repo(tmp_path: Path):
     repos = parse_extensions(path)
     assert repos[0].kind == "swarmui"
     assert repos[0].directory == "Ext"
+    assert repos[0].requires == "none"
+
+
+def test_extensions_requires_ollama(tmp_path: Path):
+    path = tmp_path / "extensions.yaml"
+    path.write_text(
+        "swarmui:\n"
+        "  - url: https://gitea.example/swarm-assistent.git\n"
+        "    ref: main\n"
+        "    dir: swarm-assistent\n"
+        "    requires: ollama\n"
+        "  - url: https://github.com/org/Always.git\n"
+        "    ref: main\n",
+        encoding="utf-8",
+    )
+    repos = parse_extensions(path)
+    assert repos[0].requires == "ollama"
+    assert repos[1].requires == "none"
+    assert repo_matches_runtime(repos[0], "ollama")
+    assert not repo_matches_runtime(repos[0], "none")
+    assert not repo_matches_runtime(repos[0], "llamacpp")
+    assert repo_matches_runtime(repos[1], "none")
+    assert repo_matches_runtime(repos[1], "ollama")
+
+
+def test_extensions_requires_any_llm(tmp_path: Path):
+    path = tmp_path / "extensions.yaml"
+    path.write_text(
+        "swarmui:\n  - url: https://example/x.git\n    requires: any-llm\n",
+        encoding="utf-8",
+    )
+    repo = parse_extensions(path)[0]
+    assert repo.requires == "any-llm"
+    assert repo_matches_runtime(repo, "ollama")
+    assert repo_matches_runtime(repo, "llamacpp")
+    assert not repo_matches_runtime(repo, "none")
+
+
+def test_extensions_requires_invalid(tmp_path: Path):
+    path = tmp_path / "extensions.yaml"
+    path.write_text(
+        "swarmui:\n  - url: https://example/x.git\n    requires: docker\n",
+        encoding="utf-8",
+    )
+    with pytest.raises(ConfigError, match="requires"):
+        parse_extensions(path)