FC-P2-T4: TUI call state machine
- CallInfo struct + CallPhase enum (Calling/Ringing/Active)
- Header shows call indicator: yellow "Calling...", magenta "Incoming", green timer
- /call sets Calling, /accept sets Active, /reject+/hangup clears
- Incoming signals show contextual messages (Offer→prompt, Answer→connected, etc.)
FC-P2-T5: Missed call display in TUI
- WS Text frames parsed for missed_call + bot_message JSON
- Missed calls: "📞 Missed call from X at HH:MM" + terminal bell
- Bot messages rendered as @botname: text
FC-P8-T5: Inline keyboard buttons in web
- CSS styled keyboard buttons (.kbd-btn)
- Bot messages with reply_markup render clickable button rows
- Click sends callback_data back to bot as bot_message
- Works in both WS text handler and handleIncomingMessage fallback
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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