[pullfrog]

Fixes the Check / test rs failure on #7670.

Failure

error[E0063]: missing field `update` in initializer of `lite::subscribe::Subscribe<'_>`
  --> rs/moq-net/src/lite/publisher.rs:10330:3

legacy_subscribe arrived on main with #8000 while this branch added the update field to Subscribe, so the merge is textually conflict-free and does not compile. The helper feeds lite-05/06 request tests, where update is not on the wire anyway; update: 0 matches every other initializer and the decode default.

Verification

• cargo check -p moq-net --lib --tests --features async,fuzz passes.
• cargo test -p moq-net --lib --features async a_subscribe_sends_the_datagrams_written_since_its_track_info passes.
• cargo fmt --all -- --check passes.

Delivered as a stacked PR

Pushing directly to quest/m1/drop-set is rejected while #7670 is queued for merging:

remote: error: GH006: Protected branch update failed for refs/heads/quest/m1/drop-set.
remote: - A pull request for this branch has been added to a merge queue.
remote:   Branches that are queued for merging cannot be updated.

Once #7670 leaves the queue, this one-line commit can be cherry-picked onto it (or this PR merged into it), and the queued merge group goes green.

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[kixelated]

Closing as superseded: moq-dev/moq#7670 cherry-picked this fix unchanged and is in the merge queue. The maintainer picked /quest-delete for this one. Thanks, Pullfrog.

(Written by Claude Opus 5.5 with high effort)