feat(ui): SPEC-V0-3-0-SURFACE-MENU-WIRE-001 MS-1 — Surface×3 functional wire (carry from MENU-WIRE-001)

[GoosLab]

Summary

• View 메뉴의 NewTerminalSurface / NewMarkdownSurface / NewCodeViewerSurface 3 stub 을 functional 로 변환 (PR feat(ui): SPEC-V0-3-0-MENU-WIRE-001 MS-1 — View menu 3 stub functional (audit Top 16 #14, lightweight) #100 carry §6 "Surface SPEC" 첫 후속).
• dispatch_command 의 surface.new.{terminal,markdown,codeviewer} namespace 활성화하여 menu/dispatch parity 확보.
• cx-free routing helper (route_surface_new_to_kind) + cx-bound entity creation 분리 — handle_search_open 패턴.

Scope

• REQ: 8 (REQ-SMW-001~008) ALL met
• AC: 7 (AC-SMW-1~7) ALL PASS
• Tests: +6 (T-SMW block) — 1355 → 1361 (lib unit). 회귀 0
• 단일 파일 수정: crates/moai-studio-ui/src/lib.rs (+189 / -9)
• SPEC: .moai/specs/SPEC-V0-3-0-SURFACE-MENU-WIRE-001/{spec.md, progress.md}

Carry

• Carry-from: SPEC-V0-3-0-MENU-WIRE-001 §6 carry-to "Surface SPEC", SPEC-V0-1-2-MENUS-001 §3.1
• Carry-to: 별 Pane SPEC (잔존 ClosePane / FocusNextPane / FocusPrevPane)

Test plan

• cargo test -p moai-studio-ui --lib → 1361 PASS, 0 fail
• cargo clippy -p moai-studio-ui --all-targets -- -D warnings → clean
• cargo fmt --check -p moai-studio-ui → no diff
• AC traceability table (progress.md)
• 기존 1355 tests 회귀 0 (additive only)

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