Release v0.28.9

What's Changed

• fix(channels): preserve unresolved secret refs by @overlord-letta in #3371
• fix(test): disable telemetry in unit runner by @overlord-letta in #3372
• fix: save base_url when saving local providers by @frezbo in #3331
• feat(channels): add feedback command [LET-9741] by @overlord-letta in #3373
• fix(listener): load agent-scoped MemFS mods [LET-9646] by @overlord-letta in #3344
• feat: export reusable Slack channel primitives by @4shub in #3374
• fix: emit subagent conversation_id in state snapshots [LET-9476] by @christinatong01 in #3240
• fix(app-server): honor runtime skill sources by @sarahwooders in #3370
• chore: bump version to 0.28.9 by @github-actions[bot] in #3380

New Contributors

• @frezbo made their first contribution in #3331

Full Changelog: v0.28.8...v0.28.9