docs(testing): add network subgraph endpoint and allocation lifetime to config reference

Author: RembrandtK

packages/issuance/docs/testing/reo/BaselineTestPlan.md

@@ -799,13 +799,25 @@ Run these operations in sequence to validate a complete indexer lifecycle:
 
 ### Arbitrum Sepolia (testnet)
 
-| Parameter         | Value                                   |
-| ----------------- | --------------------------------------- |
-| Explorer          | <https://testnet.thegraph.com/explorer> |
-| Gateway           | <https://gateway.testnet.thegraph.com>  |
-| Epoch length      | ~554 blocks (~110 minutes)              |
-| Min indexer stake | 100k GRT                                |
-| Thawing period    | Shortened for faster testing            |
+| Parameter               | Value                                                                                                                                                            |
+| ----------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------- |
+| Explorer                | <https://testnet.thegraph.com/explorer>                                                                                                                          |
+| Gateway                 | <https://gateway.testnet.thegraph.com>                                                                                                                           |
+| Network subgraph        | [eAENt2ctaMdbCY34apzXYkBy2nEYwyojjVxLahsHo9D](https://thegraph.com/explorer/subgraphs/eAENt2ctaMdbCY34apzXYkBy2nEYwyojjVxLahsHo9D?view=Query&chain=arbitrum-one) |
+| Epoch length            | ~554 blocks (~110 minutes)                                                                                                                                       |
+| Max allocation lifetime | 8 epochs (~15 hours)                                                                                                                                             |
+| Min indexer stake       | 100k GRT                                                                                                                                                         |
+| Thawing period          | Shortened for faster testing                                                                                                                                     |
+
+### Querying the network subgraph
+
+All GraphQL verification queries in this plan run against the network subgraph. To query it, use the gateway endpoint with your API key:
+
+```
+https://gateway-arbitrum.network.thegraph.com/api/<API_KEY>/subgraphs/id/eAENt2ctaMdbCY34apzXYkBy2nEYwyojjVxLahsHo9D
+```
+
+You can also use the Explorer playground at the link above. All addresses in queries must be **lowercase** — invisible Unicode characters from copy-pasting (e.g. from chat tools) will cause empty results.
 
 ### Arbitrum One (mainnet)