docs: add TASKS.md roadmap

Add future work items:
- New providers: SMS (Twilio/Telnyx), Teams, Matrix
- Provider enhancements: Gmail receive, Slack Block Kit
- Features: message editing, reactions, webhooks
- Testing: integration tests, benchmarks

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: grokify

TASKS.md

@@ -0,0 +1,48 @@
+# Tasks
+
+Roadmap and future work for OmniChat.
+
+## Providers
+
+### New Providers
+
+- [ ] SMS via Twilio (`providers/sms/twilio`)
+- [ ] SMS via Telnyx (`providers/sms/telnyx`)
+- [ ] Microsoft Teams (`providers/teams`)
+- [ ] Matrix (`providers/matrix`)
+
+### Provider Enhancements
+
+- [ ] Gmail: Add receive/inbox support (currently send-only)
+- [ ] Slack: Block Kit support for rich messages
+- [ ] Discord: Slash commands support
+- [ ] Telegram: Inline mode support
+
+## Features
+
+### Message Handling
+
+- [ ] Message editing support
+- [ ] Message deletion support
+- [ ] Reactions support across providers
+- [ ] Read receipts where supported
+- [ ] Typing indicators where supported
+
+### Infrastructure
+
+- [ ] Webhook mode as alternative to polling/Socket Mode
+- [ ] Message queue integration (Redis, NATS)
+- [ ] Configurable rate limiting per provider
+- [ ] Retry logic with exponential backoff
+
+## Testing
+
+- [ ] Integration test suite with live provider connections
+- [ ] Provider conformance test expansion
+- [ ] Benchmark suite for message throughput
+
+## Documentation
+
+- [ ] Video tutorials for provider setup
+- [ ] Architecture decision records (ADRs)
+- [ ] Contributing guide