feat(render): logic-less template parser

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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