v0.0.6: Delivery receipts (sent/delivered/read)

Protocol:
- WireMessage::Receipt { sender_fingerprint, message_id, receipt_type }
- ReceiptType enum: Delivered, Read
- id field added to KeyExchange and Message variants
- Receipts are plaintext (not encrypted) — contain only ID + type

Web client:
- Auto-sends Delivered receipt on successful decrypt
- Tracks sent message IDs with receipt status
- Displays: ✓ (sent, gray), ✓✓ (delivered, white), ✓✓ (read, blue)
- Receipt indicators update live via DOM reference

CLI TUI:
- Auto-sends Delivered receipt back to sender on decrypt
- Tracks receipt status per message ID
- Displays receipt indicators after sent messages

WASM:
- create_receipt() function for web client
- encrypt_with_id/encrypt_key_exchange_with_id for tracking
- decrypt_wire_message handles Receipt variant

17/17 protocol tests pass. Zero warnings.

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

warzone/Cargo.lock

@@ -2647,7 +2647,7 @@ dependencies = [
 
 [[package]]
 name = "warzone-client"
-version = "0.0.5"
+version = "0.0.6"
 dependencies = [
  "anyhow",
  "argon2",
@@ -2679,7 +2679,7 @@ dependencies = [
 
 [[package]]
 name = "warzone-mule"
-version = "0.0.5"
+version = "0.0.6"
 dependencies = [
  "anyhow",
  "clap",
@@ -2688,7 +2688,7 @@ dependencies = [
 
 [[package]]
 name = "warzone-protocol"
-version = "0.0.5"
+version = "0.0.6"
 dependencies = [
  "base64",
  "bincode",
@@ -2711,7 +2711,7 @@ dependencies = [
 
 [[package]]
 name = "warzone-server"
-version = "0.0.5"
+version = "0.0.6"
 dependencies = [
  "anyhow",
  "axum",
@@ -2738,7 +2738,7 @@ dependencies = [
 
 [[package]]
 name = "warzone-wasm"
-version = "0.0.5"
+version = "0.0.6"
 dependencies = [
  "base64",
  "bincode",