v0.3.1

Changelog

• 191e04f3b39a775d549a58919868c80c240724a3 chore: cut v0.3.1
• 5419492c840a6261886822e9942166c0d66875b3 feat: enhance segment persistor to record write-log watermark for freshness overlay
• d29645d11ea7c1fe4836c1b81a8a58e227ddf53f feat: implement tail overlay management for boot-restored indices and enhance listing accuracy
• 0bbae0c2a010bf92c42b25e22ced0e2e9f423913 fix: update SDK version handling in release workflow and init.py
• d19bcf341ca5e92303e227032ba5985ac0784093 fix: update README to clarify versioning for stable releases and pre-releases
• 9c4ab4a2a485a8b6d58a4cfc6fe78eca2506c8ef chore: update polign_version to v0.3.0 in README, polign.pkr.hcl, and cloudformation template