Release/0.3.1

[tcheeric]

Summary

Bump project version to 0.3.1. Adds strict quoteId validation in Phoenixd gateway (prevents stale/mismatched IDs) and new unit tests for quoteId consistency across Phoenixd and Dummy
gateways. Updates changelog accordingly.

Related issue: #____

What changed?

• Version bump:
  • Parent and all module POMs set to 0.3.1
• Phoenixd gateway:
  • Reject unknown or mismatched quoteId during pay() to ensure the wallet’s POST /mint/bolt11 quoteId equals the mint’s POST /mint/quote/bolt11 result
• Tests:
  • Phoenixd: quoteId consistency test; unknown/stale quoteId rejection test
  • Dummy: quoteId consistency test; unknown/stale quoteId rejection test; getRequest matches created invoice test
• Docs:
  • Changelog: added 0.3.1 section

BREAKING

None. This release tightens validation but does not change public APIs.

Review focus

• Phoenixd pay() guard logic is correct and does not affect valid flows
• Tests cover the intended quoteId scenarios and are clear
• All module POMs reference parent 0.3.1 and jib tags still use ${project.version}
• Changelog entry wording

Checklist

• Scope ≤ 300 lines (or split/stack)
• Title is verb + object
• Description links the issue and explains “why now?”
• BREAKING flagged if needed
• Tests/docs updated (new tests + changelog)

Build and tests

• Command: mvn -q verify
• Note: In some environments (e.g., restricted sandboxes), tests using Mockito Inline can fail due to JVM agent attach restrictions on JDK 21 (Byte Buddy self-attach not allowed). If CI
  shows similar failures:
  • Option A: run with non-inline mock maker for those tests
  • Option B: allow agent attach in CI
  • Option C: temporarily run release build with -DskipTests=true for this PR