Per-provider vision blocks; parser repairs local models' almost-JSON

config.toml now carries a [vision.<provider>] block per backend —
model/base_url/key_env — with vision_provider picking the active one,
so the committed file documents every recipe and switching is a
one-line flip. Only the active block applies; typo'd block names and
keys warn like every other config mistake.

First real Ollama run (qwen2.5vl:7b) surfaced what local models emit:
almost-JSON with trailing commas. parse_vision_response now makes one
cheap repair pass before declaring a response unusable.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_016jXZFSTZQKzAC8fqpWSz9g

tests/test_config.py

@@ -52,3 +52,47 @@ def test_unknown_toml_keys_warn(tmp_path, monkeypatch):
 def test_explicit_missing_config_errors_instead_of_silent_defaults(tmp_path):
     with pytest.raises(FileNotFoundError, match="does not exist"):
         load_config(tmp_path / "nope.toml")
+
+
+def test_vision_blocks_apply_only_for_the_active_provider(tmp_path):
+    p = tmp_path / "config.toml"
+    p.write_text(
+        """
+vision_provider = "openai-compatible"
+
+[vision.anthropic]
+model = "claude-sonnet-5"
+
+[vision."openai-compatible"]
+base_url = "http://localhost:11434/v1"
+model = "qwen2.5vl:7b"
+key_env = ""
+"""
+    )
+    cfg = load_config(p)
+    assert cfg.model == "qwen2.5vl:7b"  # the active block's model wins
+    assert cfg.vision_base_url == "http://localhost:11434/v1"
+    assert cfg.vision_key_env == ""
+    # flip the provider: the other block applies, this one is inert
+    p.write_text(p.read_text().replace('"openai-compatible"\n', '"anthropic"\n', 1))
+    cfg = load_config(p)
+    assert cfg.model == "claude-sonnet-5"
+    assert cfg.vision_base_url == ""  # untouched default
+
+
+def test_vision_block_typos_warn(tmp_path):
+    p = tmp_path / "config.toml"
+    p.write_text(
+        """
+[vision.anthropic]
+modle = "oops"
+
+[vision.anthorpic]
+model = "claude-sonnet-5"
+"""
+    )
+    with (
+        pytest.warns(UserWarning, match="modle"),
+        pytest.warns(UserWarning, match="anthorpic"),
+    ):
+        load_config(p)