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`_fallback_title` sliced the user message to `min(max_chars, 50)` and then
appended a three-character ellipsis, so the returned title could be three
characters longer than the configured cap. `_parse_title`, six lines above,
slices the model's answer to `max_chars` exactly -- both read the same
`TitleConfig.max_chars`, only one honoured it.
This is the default path, not an error branch: `config.example.yaml` ships
`title.model_name: null` ("null = fast local fallback"), so every title is
produced here unless the operator opts into a title model. `max_chars` is a
documented key with a pydantic range of 10..200; any value in 10..52 makes a
long first message overshoot its cap.
Reserve room for the ellipsis before slicing. At the shipped `max_chars: 60`
the body is still 50 characters, so default output is unchanged.
The existing `test_sync_generate_title_respects_fallback_truncation` asserted
the shape of the truncation but never its length -- at its own `max_chars=50`
it was passing on a 53-character title. It now asserts the bound it is named
after.