feat: implement REST client (PPGClient)

[2witstudios]

Summary

• Adds PPGClient Swift actor covering all 13 server endpoints with async/await
• Typed error enum with cases: network, unauthorized, notFound, conflict, serverError, decodingError, invalidResponse, notConfigured, invalidURL
• testConnection() method for verifying server reachability and auth
• Custom URLSessionDelegate for self-signed TLS via pinned CA certificate (ppg-ca.der)
• 15s request / 30s resource timeouts, Bearer token auth on all requests

Endpoints

Method	Path	Client Method
GET	/api/status	fetchStatus()
GET	/api/worktrees/:id	fetchWorktree(id:)
GET	/api/worktrees/:id/diff	fetchDiff(worktreeId:)
GET	/api/agents/:id/logs	fetchAgentLogs(agentId:lines:)
GET	/api/config	fetchConfig()
GET	/api/templates	fetchTemplates()
GET	/api/prompts	fetchPrompts()
POST	/api/spawn	spawn(name:agent:prompt:template:base:count:)
POST	/api/agents/:id/send	sendToAgent(agentId:text:keys:)
POST	/api/agents/:id/kill	killAgent(agentId:)
POST	/api/agents/:id/restart	restartAgent(agentId:prompt:)
POST	/api/worktrees/:id/merge	mergeWorktree(worktreeId:strategy:force:)
POST	/api/worktrees/:id/pr	createPR(worktreeId:title:draft:)

Plus killWorktree(worktreeId:) for POST /api/worktrees/:id/kill.

Test plan

• Verify PPGClient compiles in Xcode alongside Model types from the iOS app branch
• Test testConnection() against a running ppg serve instance
• Verify each read endpoint returns decoded Swift types
• Verify write endpoints (spawn, kill, merge, etc.) send correct JSON bodies
• Test error mapping: 401 → .unauthorized, 404 → .notFound, 409 → .conflict
• Test TLS pinning with self-signed cert via ppg-ca.der bundle resource

Closes #78

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📥 Commits

Reviewing files that changed from the base of the PR and between 34deb69 and b31c7e9.

📒 Files selected for processing (2)

• ios/PPGMobile/PPGMobile/Networking/PPGClient.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-78-rest-client

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