Parent

Part of #1402. Depends on Phase 2.

Goal

Move the sensor collector and per-sensor history state into the root-level core crate (core/src/collector/), behind a Core-owned API. Strip the AppHandle dependency from collector setup.

Workspace Context

core/ is the Tauri-independent workspace crate at the repo root. Anything moved "into Core" in this phase lands under core/src/... and stops compiling against tauri.

Scope

• Relocate src-tauri/src/workers/system_monitor.rs → core/src/collector/ (split into submodules as needed).
• Move models::hardware::HardwareMonitorState (the Arc<Mutex<...>> bag for CPU / memory / GPU / process histories) into core/src/collector/history.rs (or similar) behind a Core read API such as core::collector::history::cpu(...).
• Replace direct mutex access in src-tauri/src/commands/hardware.rs with calls into the Core read API.
• Move src-tauri/src/platform/ and the sensor-side of src-tauri/src/infrastructure/providers/ (NVAPI, WMI, procfs, drm_sys, …) into the core crate (core/src/platform/, core/src/infrastructure/providers/) so Core's dependencies remain legal under the no-tauri rule.
• Drop AppHandle from SystemMonitorController::setup.

Out of Scope

• Persistence relocation (Phase 4).
• Settings split (Phase 3.5).
• Lifecycle changes (Phase 5).

Migration Strategy

• 3a — Introduce the Core read API alongside existing direct Arc<Mutex> access. Both paths work.
• 3b — Migrate all command callers to the Core API.
• 3c — Remove the old direct-mutex path and models::hardware::HardwareMonitorState.

Definition of Done

• commands/hardware.rs no longer references Arc<Mutex<History*>> directly.
• SystemMonitorController does not take AppHandle.
• core/src/collector/ has unit tests that run via cargo test -p <core-crate> without a Tauri runtime.
• No user-visible regression on the dashboard or 1-minute usage graphs.