v0.4.2

What's Changed

• feat: streaming media encryption + deprecation cleanup by @jlucaso1 in #402
• refactor: codebase quality audit — safety, tests, DRY, dep hygiene by @jlucaso1 in #404
• feat: add mark_chat_as_read, delete_chat, delete_message_for_me by @jlucaso1 in #406
• feat: add poll creation, voting, and vote decryption by @jlucaso1 in #407
• fix: group retry sends pairwise to failing device only by @jlucaso1 in #408
• fix: always set addressing_mode on group stanzas by @jlucaso1 in #409
• feat: add V4 group invite accept + public process_sync_task by @jlucaso1 in #410
• feat: add Runtime::yield_frequency() for configurable cooperative yielding by @jlucaso1 in #411

Full Changelog: v0.4.1...v0.4.2