fix: pause active goals on app background

[BunsDev]

Persists and cancels an active on-device goal when the app enters the background, keeping goal execution within the foreground lifecycle.

Validation:

• swiftlint lint --strict
• xcodebuild build for iPhone 16 Pro simulator

[Copilot]

Pull request overview

Adds durable on-device goal support (storage + FFI + Swift orchestration) and pauses active goals when the app backgrounds, keeping goal execution within the foreground lifecycle while exposing progress via UI and Live Activity scaffolding.

Changes:

• Introduces a checked, path-scoped goal SQLite store and wires goal cleanup into session deletion/fork flows (Rust).
• Adds goal lifecycle APIs to the UniFFI surface and implements an autonomous goal runner that persists durable goal output separately from working context (Rust).
• Adds /goal parsing, goal UI card + background pause hook, and an ActivityKit + WidgetKit extension for goal progress presentation (Swift/iOS).

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
rust/ffi/src/sessions.rs	Adds checked GoalStorage and integrates goal cleanup into session artifact deletion.
rust/ffi/src/lib.rs	Exposes the new goals module and a reconcile_goals engine entry point.
rust/ffi/src/goals.rs	Implements goal lifecycle helpers (create/pause/resume/reconcile/continue) and goal snapshot types.
rust/ffi/src/chat.rs	Adds goal execution loop, goal-only tool registry (GoalComplete), durable-message journaling, and uses canonical session ID in ToolContext.
rust/Cargo.toml	Bumps pinned coven-code engine rev to pick up upstream goal APIs.
rust/Cargo.lock	Updates lockfile to match the engine rev bump.
project.yml	Adds version settings and a WidgetKit app-extension target for goal widgets.
docs/superpowers/specs/2026-07-31-on-device-goals-design.md	Adds the on-device goals design/spec doc.
app/Tests/GoalCommandParserTests.swift	Adds test coverage for /goal command parsing behavior.
app/Sources/Views/ChatView.swift	Adds goal card UI and routes /goal commands via the parser.
app/Sources/Support/Goals/GoalCommandParser.swift	Implements strict local parsing for /goal commands and errors.
app/Sources/Support/Goals/GoalActivityCoordinator.swift	Adds an ActivityKit coordinator for goal Live Activity updates.
app/Sources/Support/Goals/GoalActivityAttributes.swift	Defines ActivityKit attributes/content state shared by app + widget.
app/Sources/Support/ChatModel.swift	Stores goal snapshot state, bridges goal callbacks to @MainActor, and hooks goal lifecycle actions into the model.
app/Sources/Generated/coven_pocket_ffi.swift	Regenerated UniFFI Swift bindings for the new goal APIs/types.
app/Sources/CovenPocketApp.swift	Pauses active goals when the scene transitions to background.
app/GoalWidgets/Info.plist	Adds widget extension Info.plist.
app/GoalWidgets/GoalLiveActivityWidget.swift	Adds the WidgetKit Live Activity/Dynamic Island UI.
.beads/issues.jsonl	Updates Beads issue export with goal-related tracking issues/status changes.
.beads/interactions.jsonl	Updates Beads interactions export with status change events.

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