sqlite-vec support for Responses file_search

This wires up the Files API optional dependency into sqlite_vec and
adds the localfs Files provider to our starter template, so that
Responses API file_search tool works out of the box for sqlite_vec in
that template.

Some additional testing with this provider plus some other inference
models led me to loosen the verification test results checking a bit -
not for the tool call, but just around the assistant response with the
file_search tool call. Some providers, such as OpenAI SaaS, make
multiple tool calls to resolve the query sometimes, especially when it
cannot find an answer so tries a few permutations before returning
empty results to the user in that test.

Signed-off-by: Ben Browning <bbrownin@redhat.com>

llama_stack/templates/starter/build.yaml

@@ -17,6 +17,8 @@ distribution_spec:
     - inline::sqlite-vec
     - remote::chromadb
     - remote::pgvector
+    files:
+    - inline::localfs
     safety:
     - inline::llama-guard
     agents:

llama_stack/templates/starter/run.yaml

@@ -4,6 +4,7 @@ apis:
 - agents
 - datasetio
 - eval
+- files
 - inference
 - safety
 - scoring
@@ -75,6 +76,14 @@ providers:
       db: ${env.PGVECTOR_DB:}
       user: ${env.PGVECTOR_USER:}
       password: ${env.PGVECTOR_PASSWORD:}
+  files:
+  - provider_id: meta-reference-files
+    provider_type: inline::localfs
+    config:
+      storage_dir: ${env.FILES_STORAGE_DIR:~/.llama/distributions/starter/files}
+      metadata_store:
+        type: sqlite
+        db_path: ${env.SQLITE_STORE_DIR:~/.llama/distributions/starter}/files_metadata.db
   safety:
   - provider_id: llama-guard
     provider_type: inline::llama-guard

llama_stack/templates/starter/starter.py

@@ -12,6 +12,7 @@ from llama_stack.distribution.datatypes import (
     ShieldInput,
     ToolGroupInput,
 )
+from llama_stack.providers.inline.files.localfs.config import LocalfsFilesImplConfig
 from llama_stack.providers.inline.inference.sentence_transformers import (
     SentenceTransformersInferenceConfig,
 )
@@ -134,6 +135,7 @@ def get_distribution_template() -> DistributionTemplate:
     providers = {
         "inference": ([p.provider_type for p in inference_providers] + ["inline::sentence-transformers"]),
         "vector_io": ["inline::sqlite-vec", "remote::chromadb", "remote::pgvector"],
+        "files": ["inline::localfs"],
         "safety": ["inline::llama-guard"],
         "agents": ["inline::meta-reference"],
         "telemetry": ["inline::meta-reference"],
@@ -170,6 +172,11 @@ def get_distribution_template() -> DistributionTemplate:
             ),
         ),
     ]
+    files_provider = Provider(
+        provider_id="meta-reference-files",
+        provider_type="inline::localfs",
+        config=LocalfsFilesImplConfig.sample_run_config(f"~/.llama/distributions/{name}"),
+    )
     embedding_provider = Provider(
         provider_id="sentence-transformers",
         provider_type="inline::sentence-transformers",
@@ -212,6 +219,7 @@ def get_distribution_template() -> DistributionTemplate:
                 provider_overrides={
                     "inference": inference_providers + [embedding_provider],
                     "vector_io": vector_io_providers,
+                    "files": [files_provider],
                 },
                 default_models=default_models + [embedding_model],
                 default_tool_groups=default_tool_groups,