powersemmi / ruststream / 32818771005

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feat: broker-supplied base headers under a key-wise with_headers merge (#265)

* feat(#263): let the sink supply base headers under the publish position

A publisher, and a transaction, may now name headers that ride under every
message sent through the publish builder. The builder assembles the outgoing
map once: the sink's base first, the publish's own headers written over it key
by key, so the call site wins over the handle and the handle wins over nothing.

The headers position stays fill-once and the contract check is untouched; a
sink naming no base sends exactly what it sent before. A message declaring a
header contract can now also carry a broker's per-handle argument.

* fix(#263): route the harness handle's publish helpers through its sink

BrokerHandle::inject duplicated what the builder's InjectSink already does,
and both of its callers are codec-gated, so a build with the testing feature
and no codec left it with none and warned. The two helpers now end in the sink
like every other entry point of the handle, which deletes the duplicate and
the warning together.

Pre-existing on main rather than introduced by this branch; fixed here because
the review asked for it on this PR.

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