feat(cli): colitur table and render

Computes and renders in one process. There is deliberately no stdin-fed
render: honouring the pipe would need a JSON parser we would have to
write, purely to serialise and immediately re-parse our own view -- a
second hand-rolled component and a second place for the contract to
drift, for no benefit. colitur emit --format json | jq still composes.

An unknown extension with no --flavour is an error naming the six valid
flavours, never a silent fallback to none: guessing wrong produces
malformed output that looks fine until it does not.

A malformed template reports the parser's own reason and exits 2. A
template is user input; it must never crash the program.

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