Merge branch 'main' into bohdan/validatorapi-proposal

Resolves conflicts in the validatorapi stack against main's PR #458,
PR #451, and the dutydb high-water-mark refactor:

- dutydb/memory.rs: take main's terser comment on `delete_duty` waking
  the per-duty-type notify.
- validatorapi/component.rs: take main's BoxFuture-based callback API
  (SubscriberFn by-ref, AwaitAggSigDbFn naming, cleaner comments,
  10s upstream timeout) and layer the PR's proposal /
  submit_proposal / submit_blinded_proposal handlers, ProposerPubkeyFn,
  PROPOSAL_TIMEOUT, register_proposer_pubkey, lookup_proposer_pubkey,
  await_proposal_for_handler, proposal_timeout, pubkey_to_bls,
  verify_partial_sig_error, map_signed_data_error,
  verify_par_signed_proposal, proposal_matches_duty (+ ProposalMatchError),
  and all the per-fork slot/version/proposer-index/message-root
  accessors on top. Subscriber call sites adapted to main's by-ref
  signature (sub(&duty, &set) instead of sub(&duty, set.clone())).
  PR's tests appended to the existing test module.
- validatorapi/router.rs: take main's version verbatim — PR 461 did
  not touch router.rs, only main did (enforce_json_content_type
  middleware + json_rejection_to_api_error + content-type tests).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: varex83agent

.github/workflows/dkg-runner.yml

@@ -100,6 +100,7 @@ jobs:
           CI: "true"
           NODES: "4"
           THRESHOLD: "3"
+          EXPECT_VALIDATORS: "1"
           PLUTO_NODES: ${{ matrix.pluto_nodes }}
           CHARON_NODES: ${{ matrix.charon_nodes }}
           CHARON_BIN: ${{ github.workspace }}/bin/charon

Cargo.lock

@@ -14,6 +14,7 @@ chrono.workspace = true
 crossbeam.workspace = true
 dyn-clone.workspace = true
 dyn-eq.workspace = true
+futures.workspace = true
 hex.workspace = true
 k256.workspace = true
 libp2p.workspace = true