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## Why Long `/goal` definitions currently reach lower-level goal validation and can produce an opaque failure. This bug was reported by a user. Pasted instruction blocks are especially confusing because the composer can still contain a paste placeholder before expansion, which may otherwise fall into the generic prompt-size error path. There was also a related paste edge case where `/goal ` followed by a multiline block whose first pasted line was blank looked like a bare `/goal` command. That showed the goal usage/summary instead of setting the pasted objective. ## What Changed This adds TUI-side preflight validation for `/goal <objective>` using the shared `MAX_THREAD_GOAL_OBJECTIVE_CHARS` limit. Oversized typed, queued, and pasted goal objectives now fail locally with a goal-specific message that recommends putting longer instructions in a file and referencing that file from the goal. The TUI now also lets inline-argument slash commands consume later-line arguments before treating the first line as a bare command, so `/goal ` followed by blank lines and then objective text sets the goal instead of opening the bare `/goal` flow. ## Manual Testing 1. Start the TUI with goals enabled and an active session. 2. Submit `/goal ` followed by exactly 4,000 objective characters. It should continue through the normal goal-setting path. 3. Submit `/goal ` followed by 4,001 objective characters. It should not set a goal, and should show `Goal objective is too long: 4,001 characters. Limit: 4,000 characters.` followed by the guidance to put longer instructions in a file and reference that file from the goal. 4. Type `/goal `, paste a large block that becomes a `[Pasted Content ... chars]` placeholder, then submit. It should validate the expanded pasted text and show the goal-specific file guidance rather than the generic prompt-size error. 5. Type `/goal `, paste a multiline block whose first line is blank, then submit. It should set the objective from the non-blank pasted content instead of showing `Usage: /goal <objective>` or the bare goal summary. 6. While a turn is running, queue an oversized `/goal` command. When the queue drains, it should show the same goal-specific error and should not emit a goal-setting request.