Release v0.5.0

Changes from 0.4.0 to 0.5.0

What's Changed

• chore(deps): bump @letta-ai/letta-code from 0.28.18 to 0.29.4 by @dependabot[bot] in #216
• fix(stream): expose text stream lineage and replay cursors by @cpacker in #221
• feat: confine unattended memory sessions by @cpacker in #222
• refactor!: remove legacy stdio transport by @cpacker in #226
• feat!: support single-socket app-server sessions by @cpacker in #218

Full Changelog: v0.3.3...v0.5.0