chore: prepare release v0.9.0

Author: m0wer

CHANGELOG.md

@@ -7,6 +7,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [0.9.0] - 2026-03-19
+
 ### Added
 
 - **Persistent state across restarts** (`rescan_state.db`): Watched addresses, UTXO set, and rescan metadata (last scanned tip, start height) are now persisted to a separate bbolt database. On restart, the server restores its previous state so UTXOs are available immediately without re-scanning. The state store uses three buckets (`watched_addrs`, `utxo_set`, `rescan_meta`) and is optional (nil = no persistence) for backward compatibility with tests.
@@ -179,7 +181,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - RESTful JSON API
 - Configurable via CLI flags or environment variables
 
-[Unreleased]: https://github.com/yourusername/neutrino-api/compare/v0.8.0...HEAD
+[Unreleased]: https://github.com/yourusername/neutrino-api/compare/v0.9.0...HEAD
+[0.9.0]: https://github.com/yourusername/neutrino-api/compare/v0.8.0...v0.9.0
 [0.8.0]: https://github.com/yourusername/neutrino-api/compare/v0.7.0...v0.8.0
 [0.7.0]: https://github.com/yourusername/neutrino-api/compare/v0.6.1...v0.7.0
 [0.6.1]: https://github.com/yourusername/neutrino-api/compare/v0.6.0...v0.6.1

signatures/v0.9.0/SHA256SUMS

@@ -0,0 +1,5 @@
+66b0a15c8c213e2933e0dee2bd689080ce21e38e943f1254a75fa6c35b35dfc7  neutrinod-linux-arm64
+72e1b38bc8513bbde2503c5cb22b2a7285c10b06e659f30e02bdd2b14874a987  neutrinod-darwin-arm64
+b52a9507625b99b06ab87b7fd2fd6f5ac0b11f2df4e57a681d8901f11d79d60e  neutrinod-linux-amd64
+f858da219bf1c93b53b9e31194920483615f9bc27ae6b9c1767624956aae5cbf  neutrinod-windows-amd64.exe
+fbc0acdf29b17c8a50d0738c432020fe3e165b469d67dc15d9957af828b89b7f  neutrinod-darwin-amd64

signatures/v0.9.0/SHA256SUMS.asc

@@ -0,0 +1,16 @@
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