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0ee737cea6
Adds the persisted goal foundation for the rest of the stack. This PR is intentionally limited to feature flag and state-layer behavior; app-server APIs, model tools, runtime continuation, and TUI UX are layered in later PRs. ## Why Goal mode needs durable thread-level state before clients or model tools can safely build on it. The state layer needs to know whether a goal exists, what objective it tracks, whether it is active, paused, budget-limited, or complete, and how much time/token usage has already been accounted. ## What changed - Added the `goals` feature flag and generated config schema entry. - Added the `thread_goals` state table and Rust model for persisted thread goals. - Added state runtime APIs for creating, replacing, updating, deleting, and accounting goal usage. - Added `goal_id`-based stale update protection so an old goal update cannot overwrite a replacement. - Kept this PR scoped to persistence and state runtime behavior, with no app-server, model-facing, continuation, or TUI behavior yet. ## Verification - Added state runtime coverage for goal creation, replacement, stale update protection, status transitions, token-budget behavior, and usage accounting.