chore(release): bump version to 1.0.1, add mainnet checkpoint at 475191

Extends WalletSynchronizer's header-chain trust anchor with a new
checkpoint sourced from a fully-synced palladiumd via RPC, 20 blocks
behind the node's tip for reorg margin.

CHANGELOG.md

@@ -5,6 +5,17 @@ Technical changelog for PalladiumWallet. Format loosely follows
 by subsystem rather than strictly by date, since `0.9.0` is the first
 release and covers the full history from the initial commit.
 
+## [1.0.1] — 2026-07-17
+
+### Chores
+
+- `ChainProfiles.Mainnet.Checkpoints`: added a new anchor at height 475191
+  (20 blocks behind the synced node's tip at the time of pulling, for reorg
+  margin), sourced the same way as the existing set (`getblockhash` /
+  `getblockheader` via RPC against a fully-synced `palladiumd`). Extends how
+  far forward `WalletSynchronizer`'s header-chain trust reaches; no code or
+  behavior change.
+
 ## [1.0.0] — 2026-07-09
 
 First stable release. Closes the last open security gap from 0.9.x (header