Greptile on b17398db089:
- `enforce_turn_budget` took `len(content)` of every tool message. An
image-bearing result reaches it as a part list, so it counted parts,
not characters: six 60K-char MCP results with screenshots totalled
~18 "chars" and nothing was spilled. Part lists now count their text
characters and spill their largest text part (images stay inline).
- `_persist_multimodal_text_parts` spilled every text part under the same
tool_call_id, so with a small `tool_budget.mcp_result_size_chars` the
notes part overwrote the tool text's spill file. Each spilled part now
gets its own id.
- When `vision.max_calls_per_image` refused every image, the refusal lines
were appended after the handler's JSON closing brace. They now go into
the envelope's `result`.
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