feat(skills): interactive approval prompts for SDD gates

[robertraf]

Summary

• Replace text-based approval gates ("approved" / "go") in /sdd and /tasks with interactive AskUserQuestion prompts
• Each gate now offers 3 options: Approve, Approve with comments (proceed but carry feedback forward), and Request changes (iterate before proceeding)
• Team mode selection in /sdd also uses interactive prompts instead of text input

Files changed

• skills/sdd/SKILL.md — Phase 1, 2, 3 gates + team mode selection
• skills/tasks/SKILL.md — Step 3 task review gate

Test plan

• Run /sdd with a feature description and verify interactive prompts appear at each phase gate
• Test "Approve" option proceeds to next phase
• Test "Approve with comments" allows adding feedback and still proceeds
• Test "Request changes" triggers revision loop
• Test "Other" free-text input is handled as feedback for revision
• Run /tasks standalone and verify interactive prompt at task review step
• Verify team mode prompt appears when 3+ independent tasks are detected

https://claude.ai/code/session_01NLq3CSoNAqKDDnsKGCefJZ