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Every interpolated value is escaped for the template's flavour; the
template's own literal text never is, because that is the author's
markup. There is no raw form, so a template cannot opt out.
Scope is a stack with outward fallback, so a grid template can reach the
year number from inside a week without the view duplicating it into
every cell.
A missing key renders empty -- the one deliberate silence, so a template
survives a rite that does not set every optional field.
Mutation-tested: dropping the Escape.apply call reddens the
data-cannot-escape-flavour case.
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Placeholders, sections, inverted sections, comments. Nothing else: no
partials, no lambdas, no expression evaluation, no raw form. A template
is data, never a program, which is what keeps an untrusted template safe.
Errors rather than silence on a malformed template: an unterminated tag,
an unclosed section, a mismatched close and a partial all return Error.
Swallowing '{{name' as text is how a typo becomes invisible missing
output in a printed booklet.
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