fix(docs): fix migration notes ordering and update testnet SponsoredFPC address

Move 4.1.3 migration notes to correct position after 4.2.0 entries in
source docs, add missing version heading in versioned docs, and update
the testnet SponsoredFPC L2 contract address.

Author: Codespace

docs/developer_versioned_docs/version-v4.2.0-aztecnr-rc.2/docs/resources/migration_notes.md

@@ -279,6 +279,8 @@ Contract initialization now emits two separate nullifiers instead of one: a **pr
   }).deployed();
 ```
 
+## 4.1.3
+
 ### [Aztec.js] `TxReceipt` now includes `epochNumber`
 
 `TxReceipt` now includes an `epochNumber` field that indicates which epoch the transaction was included in.

docs/docs-developers/docs/resources/migration_notes.md

@@ -327,30 +327,6 @@ If you use `assert_contract_was_initialized_by` or `assert_contract_was_not_init
   );
 ```
 
-## 4.1.3
-
-### [Aztec.js] `TxReceipt` now includes `epochNumber`
-
-`TxReceipt` now includes an `epochNumber` field that indicates which epoch the transaction was included in.
-
-### [Aztec.js] `computeL2ToL1MembershipWitness` signature changed
-
-The function signature has changed to resolve the epoch internally from a transaction hash, rather than requiring the caller to pass the epoch number.
-
-**Migration:**
-
-```diff
-- const witness = await computeL2ToL1MembershipWitness(aztecNode, epochNumber, messageHash);
-- // epoch was passed in by the caller
-+ const witness = await computeL2ToL1MembershipWitness(aztecNode, messageHash, txHash);
-+ // epoch is now available on the returned witness
-+ const epoch = witness.epochNumber;
-```
-
-The return type `L2ToL1MembershipWitness` now includes `epochNumber`. An optional `messageIndexInTx` parameter can be passed as the fourth argument to disambiguate when a transaction emits multiple identical L2-to-L1 messages.
-
-**Impact**: All call sites that compute L2-to-L1 membership witnesses must update to the new argument order and extract `epochNumber` from the result instead of passing it in.
-
 ### Two separate init nullifiers for private and public
 
 Contract initialization now emits two separate nullifiers instead of one: a **private init nullifier** and a **public init nullifier**. Each nullifier gates its respective execution domain:
@@ -386,6 +362,30 @@ Note hashes used to be computed with the storage slot being the last value of th
 
 This change requires no input from your side unless you were testing or relying on hardcoded note hashes.
 
+## 4.1.3
+
+### [Aztec.js] `TxReceipt` now includes `epochNumber`
+
+`TxReceipt` now includes an `epochNumber` field that indicates which epoch the transaction was included in.
+
+### [Aztec.js] `computeL2ToL1MembershipWitness` signature changed
+
+The function signature has changed to resolve the epoch internally from a transaction hash, rather than requiring the caller to pass the epoch number.
+
+**Migration:**
+
+```diff
+- const witness = await computeL2ToL1MembershipWitness(aztecNode, epochNumber, messageHash);
+- // epoch was passed in by the caller
++ const witness = await computeL2ToL1MembershipWitness(aztecNode, messageHash, txHash);
++ // epoch is now available on the returned witness
++ const epoch = witness.epochNumber;
+```
+
+The return type `L2ToL1MembershipWitness` now includes `epochNumber`. An optional `messageIndexInTx` parameter can be passed as the fourth argument to disambiguate when a transaction emits multiple identical L2-to-L1 messages.
+
+**Impact**: All call sites that compute L2-to-L1 membership witnesses must update to the new argument order and extract `epochNumber` from the result instead of passing it in.
+
 ### [Aztec.js] `getPublicEvents` now returns an object instead of an array
 
 `getPublicEvents` now returns a `GetPublicEventsResult<T>` object with `events` and `maxLogsHit` fields instead of a plain array. This enables pagination through large result sets using the new `afterLog` filter option.

docs/docs/networks.md

@@ -67,7 +67,7 @@ The developer SDK/aztec-nr version (used for writing and compiling contracts) ma
 | **Class Registry** | `0x0000000000000000000000000000000000000000000000000000000000000003` | `0x0000000000000000000000000000000000000000000000000000000000000003` |
 | **MultiCall Entrypoint** | `0x0000000000000000000000000000000000000000000000000000000000000004` | `0x0000000000000000000000000000000000000000000000000000000000000004` |
 | **Fee Juice** | `0x0000000000000000000000000000000000000000000000000000000000000005` | `0x0000000000000000000000000000000000000000000000000000000000000005` |
-| **SponsoredFPC** | Not deployed | `0x09a4df73aa47f82531a038d1d51abfc85b27665c4b7ca751e2d4fa9f19caffb2` |
+| **SponsoredFPC** | Not deployed | `0x2ae02a54fd254586fd628ff46b71071bd8db32b63dc5d083f844f2c208a3923c` |
 
 ## Governance Parameters