docs: update docs for Teams integration

- USAGE.md: Teams Integration section (config, setup, compat matrix)
- CHEATSHEET.md: Teams config snippet
- API.md: TeamsBot and TeamsMessage reference
- README.md: Teams in features list
- ROADMAP.md: v2.1.0 milestone
- TODO.md/TASKS.md: Teams items

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

docs/CHEATSHEET.md

@@ -482,6 +482,28 @@ curl -X POST http://127.0.0.1:8080/ \
 POST JSON: `{"channel":"#chan","text":"msg"}`. Optional `"action":true`.
 Auth: HMAC-SHA256 via `X-Signature` header. Starts on IRC connect.
 
+## Teams Integration
+
+```toml
+# config/derp.toml
+[teams]
+enabled = true
+bot_name = "derp"
+bind = "127.0.0.1"
+port = 8081
+webhook_secret = "base64-secret-from-teams"
+incoming_webhook_url = ""           # optional, for proactive msgs
+admins = ["aad-object-id-uuid"]     # AAD object IDs
+operators = []
+trusted = []
+```
+
+Expose via Cloudflare Tunnel: `cloudflared tunnel --url http://127.0.0.1:8081`
+
+Teams endpoint: `POST /api/messages`. HMAC-SHA256 auth via `Authorization: HMAC <sig>`.
+Replies returned as JSON in HTTP response. IRC-only commands (kick, ban, topic) are no-ops.
+~90% of plugins work without modification.
+
 ## Plugin Template
 
 ```python