feat: implement WebSocket manager

[2witstudios]

Summary

• Adds WebSocketManager class with URLSessionWebSocketTask for real-time server communication
• Connection states: disconnected, connecting, connected, reconnecting(attempt: Int)
• Auto-reconnect with exponential backoff (1s, 2s, 4s, 8s, 16s, 30s max)
• Keepalive ping every 30s via DispatchSourceTimer
• Event parsing into typed WebSocketEvent enum: manifest updates, agent/worktree status changes
• Terminal commands: subscribe, unsubscribe, and input via WebSocketCommand enum
• Integrates with existing patterns: NotificationCenter, GCD, @unchecked Sendable

Closes #79

Test plan

• Verify type-checks cleanly with swiftc -typecheck (confirmed)
• Verify connection lifecycle: connect → connected → disconnect
• Verify auto-reconnect fires with exponential backoff on connection drop
• Verify keepalive pings sent every 30s while connected
• Verify event parsing for manifest_updated, agent_status_changed, worktree_status_changed
• Verify send commands (subscribe, unsubscribe, terminal_input) serialize correctly
• Verify intentional disconnect does not trigger reconnect

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📥 Commits

Reviewing files that changed from the base of the PR and between 34deb69 and 583e545.

📒 Files selected for processing (3)

• PPG CLI/PPG CLI/WebSocketManager.swift
• PPG CLI/PPG CLITests/WebSocketManagerTests.swift
• src/commands/spawn.test.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch ppg/issue-79-ws-manager

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