james-prysm e2ffb42abe allow proposer preferences on the same epoch (#16610) ...

**What type of PR is this?**

Feature

**What does this PR do? Why is it needed?**

based on https://github.com/ethereum/consensus-specs/pull/5035

adds capabilities on the validator client side to submit current epoch
attestations,
- for current epoch submissions, we skip slot 0 and start at slot 1 for
submissions, we also need a 1 slot buffer if we start the validator
client mid epoch and and need to propose during that epoch.
- current epoch submissions don't fire in fulu, only next epoch
submissions fire for gloas at the last epoch of fulu before gloas

kurtosis test by cherry picking changes on epbs-devnet-1 and running
```
participants:
  - el_type: geth
    el_image: ethpandaops/geth:epbs-devnet-0
    cl_type: prysm
    cl_image: gcr.io/offchainlabs/prysm/beacon-chain:latest
    vc_image: gcr.io/offchainlabs/prysm/validator:latest
    supernode: true
    count: 4
    vc_extra_params:
      - "--verbosity=debug"

network_params:
  fulu_fork_epoch: 0
  gloas_fork_epoch: 2
  seconds_per_slot: 6
  genesis_delay: 40

additional_services:
  - dora

global_log_level: debug

dora_params:
  image: ethpandaops/dora:gloas-support
```

**Which issues(s) does this PR fix?**

Fixes #

**Other notes for review**

**Acknowledgements**

- [x] I have read
[CONTRIBUTING.md](https://github.com/prysmaticlabs/prysm/blob/develop/CONTRIBUTING.md).
- [x] I have included a uniquely named [changelog fragment
file](https://github.com/prysmaticlabs/prysm/blob/develop/CONTRIBUTING.md#maintaining-changelogmd).
- [x] I have added a description with sufficient context for reviewers
to understand this PR.
- [x] I have tested that my changes work as expected and I added a
testing plan to the PR description (if applicable).

2026-04-14 19:45:40 +00:00

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