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## Why Users have requested the ability to edit a goal's objective after a goal has been created. This PR exposes a new `/goal edit` command in the TUI to address this request. In the process of implementing this, I also noticed an existing bug in the goal runtime. When a goal's objective is updated through the `thread/goal/set` app server API, the goal runtime didn't emit a new steering prompt to tell the agent about the new objective. This PR also fixes this hole. ## What Changed - Adds `/goal edit` in the TUI, opening an edit box prefilled with the current goal objective. - Keeps active and paused goals in their current state, resets completed goals to active, keeps budget-limited goals budget-limited, and preserves the existing token budget. - Changes the existing `thread/goal/set` behavior so editing an objective preserves goal accounting instead of resetting it. The older reset-on-new-objective behavior was left over from before `thread/goal/clear`; clients that need to reset accounting can now clear the existing goal and create a new one. - Reuses the existing goal set API path; this does not add or change app-server protocol surface area. - Adds a dedicated goal runtime steering prompt when an externally persisted goal mutation changes the objective, so active turns receive the updated objective. ## Validation - Make sure `/goal edit` returns an error if no goal currently exists - Make sure `/goal edit` displays an edit box that can be optionally canceled with no side effects - Make sure that an edited goal results in a steer so the agent starts pursuing the new objective - Make sure the new objective is reflected in the goal if you use `/goal` to display the goal summary - Make sure that `/goal edit` doesn't reset the token budget, time/token accounting on the updated goal