v0.2.4

Summary

• Patch release to restore echo interop with apps expecting the legacy payload. Listeners now accept both
  legacy literal 'echo' and the newer challenge-hex form.

Highlights

• Fix: echo listeners accept tag '/echo/req' with either data 'echo' or an even‑length hex string.
• Tests: coverage added for both awaitShareEcho and startListeningForAllEchoes across legacy, hex, and
  malformed cases.

Details

• Updated in src/echo.ts: broadened listener predicate and added small internal helper
  isEvenLengthHex(...).
• No changes to sendEcho behavior; it still sends the challenge-hex request and awaits '/echo/sender/res'.

Compatibility

• No breaking changes.
• Strongly recommended for projects integrating with igloo-desktop or older example flows that emit legacy
  '/echo/req' with data 'echo'.

Verification

• Unit tests pass.
• Manual: open the desktop view that listens for echo, then run your share flow; either payload form will
  be recognized.