Feat/p2p gossipsub

[aimendj]

Implement GossipSub validation and broadcast handling for Cryptarchia blocks and Mantle transactions, migrate to the unified nim-bincode API, add P2P integration and AutoNAT tests, optimize hot networking accessors, and clean up internal APIs and spec references.

[github-actions]

Unit Test Results

       5 files  ±  0     665 suites  ±0   1m 19s ⏱️ +14s
   598 tests +  2     589 ✔️ +  6    9 💤  -   4  0 ❌ ±0 
3 150 runs  +10  3 105 ✔️ +30  45 💤  - 20  0 ❌ ±0 

Results for commit 4067b4a. ± Comparison against base commit a90edc8.

This pull request removes 17 and adds 19 tests. Note that renamed tests count towards both.

GossipSub: subscribes and publishes /logos-blockchain-testnet/cryptarchia/1.0.0 (testnet)
GossipSub: subscribes and publishes /logos-blockchain-testnet/mempool/1.0.0 (testnet)
GossipSub: subscribes and publishes /logos-blockchain/cryptarchia/1.0.0 (mainnet)
GossipSub: subscribes and publishes /logos-blockchain/mempool/1.0.0 (mainnet)
Kademlia: DHT protocol registered as /logos-blockchain-testnet/kad/1.0.0 (testnet)
Kademlia: DHT protocol registered as /logos-blockchain/kad/1.0.0 (mainnet)
deserializeSignedMantleTxAt reads one prefixed tx inside a longer buffer
serializeBlockToSeq / deserializeBlock roundtrip (default signature, empty txs)
serializeBlockToSeq / deserializeBlock roundtrip (genesis block)
serializeBlockToSeq / deserializeBlock roundtrip (non-default signature, one tx)
…

Bootstrap peer unreachable: node logs warning and proceeds standalone
Bootstrap via trusted peer node
Discovery finds new peers through mesh
GossipSub: subscribes, broadcasts, and applies blocks
GossipSub: subscribes, broadcasts, and ingests transactions
a transaction with exactly MantleMaxOps operations is accepted
decodeAt reads one prefixed tx inside a longer buffer
encode / decode DownloadBlocksRequest roundtrip
encode / decode DownloadBlocksResponse (Failure reasons)
encode / decode DownloadBlocksResponse roundtrip (NoMore)
…

This pull request removes 6 skipped tests and adds 2 skipped tests. Note that renamed tests count towards both.

GossipSub: subscribes and publishes /logos-blockchain-testnet/cryptarchia/1.0.0 (testnet)
GossipSub: subscribes and publishes /logos-blockchain-testnet/mempool/1.0.0 (testnet)
GossipSub: subscribes and publishes /logos-blockchain/cryptarchia/1.0.0 (mainnet)
GossipSub: subscribes and publishes /logos-blockchain/mempool/1.0.0 (mainnet)
Kademlia: DHT protocol registered as /logos-blockchain-testnet/kad/1.0.0 (testnet)
Kademlia: DHT protocol registered as /logos-blockchain/kad/1.0.0 (mainnet)

Bootstrap peer unreachable: node logs warning and proceeds standalone
Discovery finds new peers through mesh