feat(app): wire priority + infosync into the node

[varex83agent]

What

Wires the priority protocol behaviour and infosync component into the running node, and triggers a cluster-wide priority exchange on the last slot of each epoch.

Previously both crates were implemented and tested but never mounted (crates/app/src/node/mod.rs carried a TODO(#402 part B)), so a pluto node neither advertised charon/priority/2.0.0 nor proposed into the info_sync QBFT round. In a mixed cluster this made Charon peers log protocols not supported: [charon/priority/2.0.0] and Priority protocol consensus: consensus timeout every epoch.

Scope — participation only ("A")

This is the participation half of #402 part B:

• CoreBehaviour gains a priority field, constructed via pluto_priority::new_component on the shared p2p_context and riding the existing Arc<qbft::Consensus> (priority uses raw QBFT, matching Charon's wirePrioritise).
• infosync::Component is built with version::SUPPORTED, the concatenated protocols() of consensus/parsigex/peerinfo/priority, and [Builder?]+Full proposal types.
• A per-epoch trigger is registered as a scheduler slot subscriber, guarded by Slot::last_in_epoch() (6s exchange timeout, min_required = cluster threshold — both matching Charon).

Deferred (TODO(#402 part B)): consuming the decided result — routing the duty path through ConsensusController and registering the protocol-switch subscriber (set_current_consensus_for_protocol). That is a functional no-op while QBFTv2 is the only consensus protocol, so it is intentionally left out. This PR does not wire proposals() into the fetcher, because Charon does not either (its Proposals()/Protocols() accessors are dead code; full-vs-blinded is decided by --builder-api).

Verification

• cargo +nightly fmt --all --check, cargo clippy --workspace --all-targets --all-features -- -D warnings, cargo test --workspace --all-features all pass.
• End-to-end on a 2-charon + 2-pluto kurtosis cluster: at the epoch boundary all four nodes reach byte-identical info_sync results (e.g. protocol: qbft=4000, parsigex=3996, peerinfo=3992, priority=3988), proving pluto's calculateResult is deterministic-equivalent to Charon's. Charon's protocols not supported and consensus timeout warnings stop; regular duties are unaffected.

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