doc: Release notes for mining IPC interface bump

doc/release-notes-33819.md

@@ -1,8 +0,0 @@
-Mining IPC
-----------
-
-- The `getCoinbaseTx()` method is renamed to `getCoinbaseRawTx()` and deprecated.
-  IPC clients do not use the function name, so they're not affected. (#33819)
-- Adds `getCoinbaseTx()` which clients should use instead of `getCoinbaseRawTx()`. It
-  contains all fields required to construct a coinbase transaction, and omits the
-  dummy output which Bitcoin Core uses internally. (#33819)

doc/release-notes-34568.md

@@ -0,0 +1,11 @@
+Mining IPC
+----------
+
+The IPC mining interface now requires mining clients to use the latest `mining.capnp` schema. Clients built against older schemas will fail when calling `Init.makeMining` and receive an RPC error indicating the old mining interface is no longer supported. Mining clients must update to the latest schema and regenerate bindings to continue working. (#34568)
+
+Notable IPC mining interface changes since the last release:
+- `Mining.createNewBlock` and `Mining.checkBlock` now require a `context` parameter.
+- `Mining.waitTipChanged` now has a default `timeout` (effectively infinite / `maxDouble`) if the client omits it.
+- `BlockTemplate.getCoinbaseTx()` now returns a structured `CoinbaseTx` instead of raw bytes.
+- Removed `BlockTemplate.getCoinbaseCommitment()` and `BlockTemplate.getWitnessCommitmentIndex()`.
+- Cap’n Proto default values were updated to match the corresponding C++ defaults for mining-related option structs (e.g. `BlockCreateOptions`, `BlockWaitOptions`, `BlockCheckOptions`).