Extract DocApprovalCore Swift package for iOS and macOS

[enricopiovesan]

Summary

• Add shared apps/doc-approval/DocApprovalCore Swift package (HTTP sendCommand, SSE subscribe, AppStateViewModel, SessionListViewModel, SessionDiscovery, output parsing)
• Wire ios-swift and macos-swift to the local package; remove duplicated client/view-model sources
• Align Apple shells with command dispatch + SSE (same pattern as TraverseCore / Extract TraverseCore Swift package shared between ios-swift and macos-swift #58)

Governing Spec

• 033-http-json-api — app SSE events and sessions
• 059-http-command-dispatch — command dispatch
• docs/design-language.md — three-zone UI shells

Project Item

• Closes Extract DocApprovalCore Swift package: shared iOS + macOS client #72
• Project 2 item for Extract DocApprovalCore Swift package: shared iOS + macOS client #72

Definition of Done

• Swift 6, iOS 17+ / macOS 14+ targets
• SessionListViewModel polls sessions every 10s
• DocApprovalClient.sendCommand(sessionId:command:payload:…) session-scoped dispatch
• Unit tests: SSE parsing, session list parsing, command construction
• Both ios-swift and macos-swift import local DocApprovalCore
• No UIKit/AppKit in DocApprovalCore

Validation

• cd apps/doc-approval/DocApprovalCore && swift test (12 tests)
• xcodebuild iOS Simulator (iPhone 17) BUILD SUCCEEDED
• xcodebuild macOS BUILD SUCCEEDED
• bash scripts/ci/repository_checks.sh

Architecture boundary

• UI shells render runtime fields only; transitions owned by Traverse SSE events
• Public HTTP/SSE surfaces only

Checklist

• Issue linked and Project 2 item updated
• Updated AGENTS.md / README.md Ready summary
• No business logic added to UI layer
• CI gates pass locally where applicable

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