feat: wzp-analyzer binary — protocol analyzer with TUI (#13, #14, #15)

New binary: wzp-analyzer joins a room as a passive observer and displays
real-time per-participant quality metrics.

Features:
- Passive observation: connects to relay, receives all media, never sends
- Participant detection: identifies senders by sequence number streams
- Per-participant stats: packets, loss%, jitter, codec, codec switches
- TUI mode (ratatui): color-coded table (green/yellow/red by loss),
  10 FPS refresh, session header, quit with q/Ctrl+C
- No-TUI mode: prints stats to stderr every 2s (for headless/CI use)
- Capture mode: binary .wzp format with microsecond timestamps for
  offline replay (magic WZP\x01, JSON header, per-packet records)
- Session summary on exit

Usage:
  wzp-analyzer 193.180.213.68:4433 --room general
  wzp-analyzer 193.180.213.68:4433 --room general --no-tui --duration 60
  wzp-analyzer 193.180.213.68:4433 --room general --capture session.wzp

372 tests passing, 0 regressions.

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

crates/wzp-client/Cargo.toml

@@ -21,6 +21,9 @@ anyhow = "1"
 serde = { workspace = true }
 serde_json = "1"
 chrono = "0.4"
+clap = { version = "4", features = ["derive"] }
+ratatui = "0.29"
+crossterm = "0.28"
 rustls = { version = "0.23", default-features = false, features = ["ring", "std"] }
 cpal = { version = "0.15", optional = true }
 libc = "0.2"
@@ -99,6 +102,10 @@ linux-aec = ["dep:webrtc-audio-processing"]
 name = "wzp-client"
 path = "src/cli.rs"
 
+[[bin]]
+name = "wzp-analyzer"
+path = "src/analyzer.rs"
+
 [[bin]]
 name = "wzp-bench"
 path = "src/bench_cli.rs"