feat(config): flavour is settable, and an INI overlay is diagnosed

The escaping flavour was the one rendering setting with no config key,
so a template whose extension says nothing needed the flag every run.
Unset still means infer, which config --show reports as (infer) rather
than (none).

Backfills the 0.8.0 and 0.9.0 changelog entries. Both were tagged by
hand rather than through 'make release', which is precisely the guard
that would have refused a release with no changelog line.

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