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/USAGE.md

@@ -1,6 +1,6 @@
 # featherChat Usage Guide
 
-**Version:** 0.0.21
+**Version:** 0.0.46
 
 ---
 
@@ -311,6 +311,63 @@ The web client supports the same slash commands as the TUI: `/peer`, `/p`, `/r`,
 | `/reject` | Reject incoming call |
 | `/hangup` | End current call |
 
+### Group Calls
+
+Group calls allow multi-party audio within a group context. Any group member can initiate a call, and others can join at any time.
+
+| Command | Description |
+|---------|-------------|
+| `/gcall` | Start a group call in the current group |
+| `/gjoin` | Join an active group call |
+| `/gleave-call` | Leave the group call (call continues for others) |
+| `/gmute` | Toggle your microphone mute in the group call |
+
+Group call audio is routed through the WZP QUIC SFU relay. Media is transport-encrypted (QUIC TLS) but not E2E encrypted -- the relay can observe audio streams. MLS-based E2E encryption for group calls is planned.
+
+---
+
+## Read Receipts
+
+featherChat tracks message delivery and read status with three indicators:
+
+| Indicator | Symbol | Meaning |
+|-----------|--------|---------|
+| Sent | Single gray tick | Message sent to server, no confirmation yet |
+| Delivered | Double gray tick | Recipient decrypted the message |
+| Read | Double blue tick | Recipient viewed the message in their viewport |
+
+Read receipts are sent automatically when messages enter the visible area of the chat window. The system uses the sender's fingerprint for tracking and a dedup set to avoid sending duplicate read receipts for the same message.
+
+---
+
+## Markdown Formatting
+
+Messages support markdown formatting in both the TUI and web client:
+
+| Syntax | Result |
+|--------|--------|
+| `**bold**` | **bold** |
+| `*italic*` | *italic* |
+| `` `code` `` | `inline code` |
+| `# Header` | Header (at start of line) |
+| `> quote` | Block quote (at start of line) |
+| `- item` | List item (at start of line) |
+
+Markdown is rendered inline in messages. In the TUI, bold, italic, and code spans use terminal attributes. In the web client, they render as HTML.
+
+---
+
+## Admin Commands
+
+Server administration commands for operators:
+
+| Command | Description |
+|---------|-------------|
+| `/admin-calls` | List all active calls on the server |
+| `/admin-unalias <alias>` | Remove any user's alias (requires admin password) |
+
+`/admin-unalias` prompts for the server's admin password (set via `WARZONE_ADMIN_PASSWORD` environment variable). `/admin-calls` currently has no auth protection -- an admin role system is planned.
+
 ---
 
 ## Groups