feat(documents): delete document folders; fix CI simulator destination; restructure GAP roadmap

[Adron]

Summary

Bundles the waiting work on dev: a new delete-document-folder capability in the Documents tab, a CI build fix (the GitHub runner no longer has the pinned simulator), and a roadmap-doc restructure around App Store ship-blockers.

What's included

• documents — folder delete (feature): APIClient.deleteDocumentFolder(id:) issues DELETE /api/documents/folders/{id} (the server cascades to subfolders/documents); AppDataStore.removeDocumentFolder optimistically drops it from the cache. DocumentsView / DocumentFolderView expose Delete via swipe action and context menu, gated behind a confirmation dialog that warns about cascade. Failures re-sync (refreshDocuments() / load()) so a failed delete never leaves the UI out of sync; 401 routes through authState.handleUnauthorized() per the project's 401 contract. Adds APIClientDocumentsTests cases for the DELETE path and the 401 case.
• ci — build fix: .github/workflows/ios.yml now builds against generic/platform=iOS Simulator instead of platform=iOS Simulator,name=iPhone 16,OS=latest. The runner image no longer ships a plain "iPhone 16" (only 16e/17/17 Pro/Air), so the build was failing to resolve a destination. A generic destination is correct for a build-only job and won't break on future runner image changes.
• docs — roadmap restructure: GAP-NEXT-STEPS.md reorganized around App Store ship-blockers (Phase 14 UGC safety/moderation, Phase 0.5 Info.plist hygiene) with tiered remaining work; GAP-ENDPOINTS.md §H documents the unverified moderation endpoints; GAP-APPLE.md gains a pre-submission open-questions checklist and push-in-v1 scope. Also removes stray tool markup (</content></invoke>) accidentally written to the end of GAP-NEXT-STEPS.md.

Testing

• xcodebuild build (generic iOS Simulator destination) — BUILD SUCCEEDED, which also confirms the CI fix locally.
• xcodebuild test -only-testing:InterlinedListTests/APIClientDocumentsTests (iPhone 17 Pro, iOS 26.5, serialized) — 16 passed, 0 failures, including the two new folder-delete tests.

Notes

• The folder-delete API contract (cascade behavior) matches GAP-ENDPOINTS.md's folder-scoped routing; behavior on a real backend wasn't exercised here (unit tests stub HTTP).
• Heads-up: the git remote reports it has moved to CompositeCode/interlinedlist-ios — the push redirected successfully, but the origin URL may be worth updating.

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