Performance pass with Instruments #47

Profile the hot paths and catch any quadratic surprises before launch.

Targets

SpriteKit

• Time Profiler during heavy farm scene activity: multiple plots animating + ambient NPCs (butterflies, birds, avatar wandering, pet wandering)
• Confirm 60fps on iPhone 12-era devices, 120fps on Pro devices
• Identify any retain cycles or main-thread blockers

SwiftData

• Seed an in-memory store with 1000+ HabitLogEntry rows, 100+ Task rows, 20+ Goal rows with SubGoals
• Time Profiler the daily tick (SystemEventsHandler.runDailyTick) — should be well under 100ms
• Time Profiler the Stats screen queries (depends on Stats / Insights screen #31) — should not block the UI thread
• Profile QuestInteractor.candidatePool at large data volumes

Launch

• App Launch instrument: cold launch under 1s on iPhone 12, under 500ms on Pro
• No work done synchronously in AppEnvironment.bootstrap that should be deferred

Acceptance criteria

• No frame drops below 60fps during normal farm-tab usage on supported devices
• Daily tick runs under 100ms even with 1000+ entries
• Cold launch under 1s on iPhone 12
• Any findings documented + fixes filed as separate issues