docs: comprehensive update all docs to v0.0.46

11 files updated to reflect current state (v0.0.22 → v0.0.46):

ARCHITECTURE.md:
- Ring tones, group calls, read receipts, markdown rendering sections
- Bot API expanded (BotFather, numeric IDs, Telegram compat)
- Admin commands, known issues, 155 tests

TASK_PLAN.md:
- All P1-P4 marked DONE with version numbers
- Additional completed work section (bots, ETH, ring tones, group calls)
- New FC-P7 (Voice & Transport): cpal, Sender Keys, WebTransport
- FC-P6-T9/T10 added

PROGRESS.md:
- Full version history table v0.0.22 through v0.0.46
- Known issues section

README.md:
- Voice calls, ring tones, group calls, read receipts, markdown, 155 tests

SECURITY.md:
- Bot API security, voice call security, admin commands sections
- Updated protection tables

USAGE.md:
- Group calls, read receipts, markdown formatting, admin commands

CLIENT.md:
- Call commands, read receipts, markdown rendering

LLM_HELP.md + LLM_BOT_DEV.md:
- Call/group call/admin commands, ring tones, per-bot numeric IDs

TESTING_E2E.md:
- Tests 16-18: ring tones, group calls, admin commands

CLAUDE.md:
- Ring tone notes, group signal endpoint, MLS roadmap

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

warzone/docs/CLIENT.md

@@ -1,6 +1,6 @@
 # Warzone Client -- Operation Guide
 
-**Version:** 0.0.21
+**Version:** 0.0.46
 
 ---
 
@@ -289,6 +289,48 @@ When decryption fails on an incoming message, the TUI automatically:
 The next incoming `KeyExchange` from that peer will create a fresh session
 without manual intervention.
 
+### Voice Calls
+
+The TUI supports DM and group call commands:
+
+| Command | Description |
+|---------|-------------|
+| `/call [peer]` | Initiate a voice call with the current or specified peer |
+| `/accept` | Accept an incoming call |
+| `/reject` | Reject an incoming call |
+| `/hangup` | End the current call |
+
+**Call state display:** The TUI header bar shows call status with color coding:
+
+- **Yellow "CALLING..."** — outgoing call ringing, waiting for peer to accept
+- **Green "IN CALL" + timer** — active call with elapsed duration (MM:SS)
+- No indicator when idle
+
+**Note:** TUI audio requires the web client. When a call is active in the TUI, a hint is displayed directing the user to open the web client for actual audio. The TUI handles signaling (offer/answer/ICE) but does not capture or play audio.
+
+### Read Receipts
+
+Read receipts track message delivery through three states: sent, delivered, and read.
+
+- **Sender fingerprint tracking:** Each outgoing message records the sender's fingerprint so the system can match incoming receipts to the correct message.
+- **Dedup set:** A per-conversation set prevents sending duplicate read receipts for the same message. Once a read receipt is sent for a message ID, it is not sent again.
+- **Viewport-based:** Read receipts are triggered when a message scrolls into the visible area of the chat. Messages that are never scrolled into view do not generate read receipts.
+
+### Markdown Rendering
+
+Messages support inline markdown formatting via the `md_to_spans` function, which converts markdown syntax into ratatui `Span` elements with appropriate styling:
+
+| Syntax | TUI Rendering |
+|--------|---------------|
+| `**bold**` | Bold attribute |
+| `*italic*` | Italic attribute |
+| `` `code` `` | Dark gray background, monospace feel |
+| `# Header` | Bold + uppercase (line start only) |
+| `> quote` | Italic + gray foreground (line start only) |
+| `- list item` | Bullet prefix (line start only) |
+
+Markdown is parsed per-message at render time. The web client renders the same syntax as HTML elements.
+
 ---
 
 ## 5. Full Command Reference