Add Teams integration

[johntheyoung]

Summary

• add Teams commands for listing joined teams, listing channels, and sending channel messages
• add Teams chat commands for listing chats, sending to an existing chat, and sending one-on-one DMs
• add delegated Teams channel/chat scopes and enterprise delegated-only runtime gating
• add granular action allowlisting via --enable-actions / MOG_ENABLE_ACTIONS for safer agent command exposure
• add a standalone .agents/skills/mog skill for safe Microsoft 365 automation via mog
• update README and auth help for Teams workloads

Verification

• go test ./...
• git diff --check
• go build -o bin/mog ./cmd/mog
• ./bin/mog teams --help
• ./bin/mog teams chat-send --help
• ./bin/mog teams dm-send --help
• /home/jmy/code/hermes-agent/venv/bin/python /home/jmy/.codex/skills/.system/skill-creator/scripts/quick_validate.py .agents/skills/mog
• MOG_PROFILE=dexterton MOG_ENABLE_COMMANDS=teams MOG_ENABLE_ACTIONS=teams.dm-send ./bin/mog --json teams dm-send --to john.young@dexterton.com --body "DM support smoke test" --dry-run
• MOG_PROFILE=dexterton MOG_ENABLE_COMMANDS=teams MOG_ENABLE_ACTIONS=teams.chats ./bin/mog --json teams chats --max 1