v0.1.16

Keep the vendored copies out of this package's coverage floor

src/vendor/** is generated and identical in every package that carries it, so
measuring it here counts the same lines N times and holds this package to a
floor for code it cannot change — which is what pushed several suites under
their thresholds the moment the copies landed.

The behaviour is not left unmeasured: it is pinned where it broke, in bay's
quasar-bridge suite, which now covers both manager shapes the loader has to
accept.

Take the quasar loader from the vendored copy

Seven packages carried the same optional-peer loader: the runtime specifier,
the manager guard, the command check and the messages around them. Only three
things differed — the commands each issues, what it does with them, and how it
builds an error — so those are passed in and the rest is generated from
scripts/vendor/quasarConnection.ts.

Two things the packages' own tests caught while it was being unified, and both
are now properties of the shared copy rather than of one package:

The module namespace is probed with in before it is read. Reading an export a
namespace does not have is not always harmless — under a test double it raises
instead of answering undefined, so the probe failed on the mock rather than
falling through to the default export.

The error is built by the caller. nova raises NovaError with E_NOVA_* codes
that a caller catches on, and a shared helper throwing a bare Error would have
dropped them silently. Packages that offer a client object instead of a
connection name keep saying so, too: unifying the wording had removed the
alternative from the one message where it was actionable.

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Changes since v0.1.15.