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jam_getBlockExtrinsics: expose full extrinsic content (tickets, guarantees, assurances) for a block #839

Description

@mariopino

Feature request

Currently jam_getBlock returns only counts for the three extrinsic categories:

{
  "timeslot": 878,
  "guarantees_count": 3,
  "tickets_count": 3,
  "assurances_count": 0
}

To display meaningful block detail in a block explorer it would be very useful to have a method that returns the full content of each extrinsic.

Proposed method

jam_getBlockExtrinsics(blockHash: string)

Suggested response shape:

{
  "tickets": [
    { "attempt": 0, "id": "0x..." }
  ],
  "guarantees": [
    {
      "core_index": 0,
      "package_hash": "0x...",
      "erasure_root": "0x...",
      "exports_root": "0x...",
      "auth_output": "0x...",
      "gas_used": 12345,
      "results": [
        {
          "service_id": 0,
          "code_hash": "0x...",
          "payload_hash": "0x...",
          "accumulate_gas": 1000,
          "gas_used": 800,
          "result": "ok | out-of-gas | panic | bad-exports | bad-code | code-oversize"
        }
      ]
    }
  ],
  "assurances": [
    { "anchor": "0x...", "validator_index": 0 }
  ]
}

Context

This is needed for JarScan, a block explorer for JAR chain that connects directly to a Grey node via WebSocket JSON-RPC. The data is already in the store — it just needs to be surfaced through the RPC layer.

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