feat: add durable on-device goals

[BunsDev]

Implements on-device /goal execution with durable FFI-backed lifecycle, checked SQLite goal storage, autonomous continuation, slash-command UI, and a Live Activity widget.

Validation:

• cargo test -p coven-pocket-ffi goals::tests
• cargo clippy -p coven-pocket-ffi --all-targets -- -D warnings
• cargo fmt --all --check
• swiftlint lint --strict
• xcodebuild test ... GoalCommandParserTests
• ./scripts/build-xcframework.sh
• simulator build, install, and launch on iPhone 16 Pro (iOS 26.5)

Simulator interaction remains behind the app's existing local unlock screen; the binary launches successfully.

[Copilot]

Pull request overview

Adds a durable on-device /goal workflow to Coven Pocket by extending the Rust FFI with goal storage + lifecycle operations, integrating an autonomous goal runner into the existing query loop, and wiring a Swift slash-command/UI layer plus a WidgetKit Live Activity presentation.

Changes:

• Introduces a checked, path-scoped goal SQLite store (goals.sqlite) and integrates goal cleanup with session lifecycle in the Rust persistence layer.
• Adds Rust FFI goal APIs (start/pause/resume/clear/status/reconcile) and a goal-capable query-loop runner that supports durable message journaling and a goal-only GoalComplete tool.
• Adds Swift /goal command parsing, in-app goal card controls, and a WidgetKit Live Activity target wired via ActivityKit.

Reviewed changes

Copilot reviewed 17 out of 20 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
rust/ffi/src/sessions.rs	Adds GoalStorage wrapper over checked storage; validates goal DB sidecars; clears goals during session cleanup.
rust/ffi/src/lib.rs	Exposes goal types/FFI surface and adds PocketEngine.reconcile_goals.
rust/ffi/src/goals.rs	New Rust goal lifecycle module (FFI-facing types + blocking-backed operations + continuation).
rust/ffi/src/chat.rs	Integrates goal runner into ChatSession, adds goal-only tool registry, durable message journaling, and cumulative cost tracking.
rust/Cargo.toml	Bumps pinned coven-code engine rev to include upstream goal/path APIs.
rust/Cargo.lock	Updates lockfile sources to match the new engine pin.
project.yml	Adds widget extension target + Live Activity entitlements/versions.
docs/superpowers/specs/2026-07-31-on-device-goals-design.md	Adds approved design spec for on-device goals and Live Activity behavior.
app/Tests/GoalCommandParserTests.swift	Adds unit tests for /goal parsing and local error handling.
app/Sources/Views/ChatView.swift	Adds a goal status card and routes /goal commands to model operations.
app/Sources/Support/Goals/GoalCommandParser.swift	Implements local /goal command parsing per documented syntax.
app/Sources/Support/Goals/GoalActivityCoordinator.swift	Adds an ActivityKit coordinator for goal progress presentation.
app/Sources/Support/Goals/GoalActivityAttributes.swift	Defines ActivityKit attributes/content state for goal Live Activity.
app/Sources/Support/ChatModel.swift	Adds goal state to the model, bridges FFI callbacks to @MainActor, and coordinates ActivityKit updates.
app/Sources/Generated/coven_pocket_ffi.swift	Regenerates UniFFI bindings to include goal APIs and records/types.
app/GoalWidgets/Info.plist	Adds widget extension Info.plist for WidgetKit target.
app/GoalWidgets/GoalLiveActivityWidget.swift	Implements the goal Live Activity/Dynamic Island widget UI.
.beads/issues.jsonl	Updates beads issues to track goal work items.
.beads/interactions.jsonl	Records beads interaction updates related to milestones/status changes.

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