feat(swift-ios): add project settings and response streaming controls

[t3dotgg]

SwiftUI ignored project setting overrides and had no response streaming control.

Project settings now save immediately from Settings, New Task, and the home project menu. Each setting can return to its environment value. Writes preserve other override keys and stay on the selected environment. New tasks use project model and workspace defaults while keeping explicit model choices. Build mode and full access are unchanged.

Response streaming supports turns, paragraphs, and tokens, with a warning before token mode. Unsupported controls stay unavailable on older servers.

Verification: CI is green on 2fd199a, including native contract fixtures and tests. Native CI ran 278 tests with zero failures and one skip. A separate 90-test pass in the main integration worktree covered project contracts, defaults, multi-environment routing, new tasks, shell projection, and shared preferences before the review fixes. Focused tests were added for unavailable providers and legacy project defaults. Macroscope correctness is green with no findings. Integrated UI evidence is pending. No simulator or device build ran in this worktree. git diff --check passed.

Created with Codex.

[cursor]

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[macroscopeapp]

Approvability

Verdict: Not approved

Macroscope's review found this PR not approvable — This PR adds project-scoped settings and response-streaming controls, persists those choices, and applies project defaults to existing thread creation behavior. The resulting user-facing and cross-client runtime changes extend beyond a localized UI adjustment.

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[github-actions]

Thread transfer impact

✅ Thread transfer remains within every enforced ceiling.

ℹ️ No successful main baseline artifact is available yet. This run establishes the initial measurement.

Provider	Metric	Main baseline	This PR	Impact	PR ceiling
Codex	Total thread wire	—	13.6 KiB	—	15.1 KiB	✅
Codex	Thread snapshot wire	—	7.0 KiB	—	7.3 KiB	✅
Codex	Live turn WebSocket wire	—	6.5 KiB	—	7.8 KiB	✅
Codex	Live turn WebSocket decoded	—	57.1 KiB	—	66.4 KiB	✅
Codex	Live turn messages	—	10	—	21	✅
Claude	Total thread wire	—	13.6 KiB	—	15.1 KiB	✅
Claude	Thread snapshot wire	—	7.1 KiB	—	7.3 KiB	✅
Claude	Live turn WebSocket wire	—	6.5 KiB	—	7.8 KiB	✅
Claude	Live turn WebSocket decoded	—	57.8 KiB	—	66.4 KiB	✅
Claude	Live turn messages	—	9	—	21	✅

Baseline: unavailable · PR result: 2fd199a · Source CI: success

Scenario and decoded snapshot size

10 historical turns, 5 command tools per turn, 878.9 KiB retained MCP result per historical turn, and a 1.05 MiB retained result in the measured turn.

• Codex decoded thread snapshot: 113.9 KiB
• Claude decoded thread snapshot: 114.6 KiB

Updated in place by a trusted workflow. PR artifacts are strictly validated and never executed.