aztec-node merged the foundation patch series in
[aztec-labs-eng/aztec-node#310](https://github.com/aztec-labs-eng/aztec-node/pull/310),
so the pin moves past it and the series drops to empty.

- `labs` gitlink `a8c1f0b4fb` → `54e3383c4b` (aztec-node `main`, the
sync merge commit)
-
`labs-patches/0001-feat-protocol-derive-the-protocol-nullifier-from-the.patch`
deleted — it is upstream verbatim: the patch reverse-applies cleanly to
`54e3383c4b`

The bump also brings in the rest of aztec-node `main` since `a8c1f0b4`:
aztec-labs-eng/aztec-node#306 (remove the ci-release-pr canary),
aztec-labs-eng/aztec-node#308 (metric on loaded publishers/attesters),
aztec-labs-eng/aztec-node#202 (bound BLOCK_TXS explicit-hash requests),
aztec-labs-eng/aztec-node#309 (the unattended nightly tag gets its own
workflow), and in aztec-labs-eng/aztec-node#310 the labs toolchain pin
bump to `6.0.0-nightly.20260923`.

Done with `./labs-patches/bootstrap.sh bump main` after removing the
drained patch; with no patches left it just checks out the new base.

## Verification

- `./labs-patches/bootstrap.sh status` — series empty, applied on
`54e3383c4b`
- `./labs-patches/bootstrap.sh check` — clean against the new gitlink
- `./labs-patches/bootstrap.sh check_staged` — the staged gitlink is an
upstream commit
- `./labs-patches/bootstrap.sh test` — 14/14 lifecycle checks pass

The labs build against this tree is CI's job here; nothing was built
locally.