feat: add /gsd-spike, /gsd-sketch, /gsd-spike-wrap-up, /gsd-sketch-wrap-up commands

First-class GSD commands for rapid feasibility spiking and UI design sketching,
ported from personal skills into the framework with full GSD integration:

- Spikes save to .planning/spikes/, sketches to .planning/sketches/
- GSD banners, checkpoint boxes, Next Up blocks, gsd-sdk query commits
- --quick flag skips intake/decomposition for both commands
- Wrap-up commands package findings into project-local .claude/skills/
  and write WRAP-UP-SUMMARY.md to .planning/ for project history
- Neither requires /gsd-new-project — auto-creates .planning/ subdirs

Pipeline integration:
- new-project.md detects prior spike/sketch work on init
- discuss-phase.md loads spike/sketch findings into prior context
- plan-phase.md includes findings in planner <files_to_read>
- do.md routes spike/sketch intent to new commands
- explore.md offers spike/sketch as output routes
- next.md surfaces pending spike/sketch work as notices
- pause-work.md detects active sketch context for handoff
- help.md documents all 4 commands with usage examples
- artifact-types.md registers spike/sketch artifact taxonomy

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

commands/gsd/sketch-wrap-up.md

@@ -0,0 +1,31 @@
+---
+name: gsd:sketch-wrap-up
+description: Package sketch design findings into a persistent project skill for future build conversations
+allowed-tools:
+  - Read
+  - Write
+  - Edit
+  - Bash
+  - Grep
+  - Glob
+  - AskUserQuestion
+---
+<objective>
+Curate sketch design findings and package them into a persistent project skill that Claude
+auto-loads when building the real UI. Also writes a summary to `.planning/sketches/` for
+project history. Output skill goes to `./.claude/skills/sketch-findings-[project]/` (project-local).
+</objective>
+
+<execution_context>
+@~/.claude/get-shit-done/workflows/sketch-wrap-up.md
+@~/.claude/get-shit-done/references/ui-brand.md
+</execution_context>
+
+<runtime_note>
+**Copilot (VS Code):** Use `vscode_askquestions` wherever this workflow calls `AskUserQuestion`.
+</runtime_note>
+
+<process>
+Execute the sketch-wrap-up workflow from @~/.claude/get-shit-done/workflows/sketch-wrap-up.md end-to-end.
+Preserve all curation gates (per-sketch review, grouping approval, CLAUDE.md routing line).
+</process>

commands/gsd/sketch.md

@@ -0,0 +1,45 @@
+---
+name: gsd:sketch
+description: Rapidly sketch UI/design ideas using throwaway HTML mockups with multi-variant exploration
+argument-hint: "<design idea to explore> [--quick]"
+allowed-tools:
+  - Read
+  - Write
+  - Edit
+  - Bash
+  - Grep
+  - Glob
+  - AskUserQuestion
+---
+<objective>
+Explore design directions through throwaway HTML mockups before committing to implementation.
+Each sketch produces 2-3 variants for comparison. Sketches live in `.planning/sketches/` and
+integrate with GSD commit patterns, state tracking, and handoff workflows.
+
+Does not require `/gsd-new-project` — auto-creates `.planning/sketches/` if needed.
+</objective>
+
+<execution_context>
+@~/.claude/get-shit-done/workflows/sketch.md
+@~/.claude/get-shit-done/references/ui-brand.md
+@~/.claude/get-shit-done/references/sketch-theme-system.md
+@~/.claude/get-shit-done/references/sketch-interactivity.md
+@~/.claude/get-shit-done/references/sketch-tooling.md
+@~/.claude/get-shit-done/references/sketch-variant-patterns.md
+</execution_context>
+
+<runtime_note>
+**Copilot (VS Code):** Use `vscode_askquestions` wherever this workflow calls `AskUserQuestion`.
+</runtime_note>
+
+<context>
+Design idea: $ARGUMENTS
+
+**Available flags:**
+- `--quick` — Skip mood/direction intake, jump straight to decomposition and building. Use when the design direction is already clear.
+</context>
+
+<process>
+Execute the sketch workflow from @~/.claude/get-shit-done/workflows/sketch.md end-to-end.
+Preserve all workflow gates (intake, decomposition, variant evaluation, MANIFEST updates, commit patterns).
+</process>

commands/gsd/spike-wrap-up.md

@@ -0,0 +1,31 @@
+---
+name: gsd:spike-wrap-up
+description: Package spike findings into a persistent project skill for future build conversations
+allowed-tools:
+  - Read
+  - Write
+  - Edit
+  - Bash
+  - Grep
+  - Glob
+  - AskUserQuestion
+---
+<objective>
+Curate spike experiment findings and package them into a persistent project skill that Claude
+auto-loads in future build conversations. Also writes a summary to `.planning/spikes/` for
+project history. Output skill goes to `./.claude/skills/spike-findings-[project]/` (project-local).
+</objective>
+
+<execution_context>
+@~/.claude/get-shit-done/workflows/spike-wrap-up.md
+@~/.claude/get-shit-done/references/ui-brand.md
+</execution_context>
+
+<runtime_note>
+**Copilot (VS Code):** Use `vscode_askquestions` wherever this workflow calls `AskUserQuestion`.
+</runtime_note>
+
+<process>
+Execute the spike-wrap-up workflow from @~/.claude/get-shit-done/workflows/spike-wrap-up.md end-to-end.
+Preserve all curation gates (per-spike review, grouping approval, CLAUDE.md routing line).
+</process>

commands/gsd/spike.md

@@ -0,0 +1,41 @@
+---
+name: gsd:spike
+description: Rapidly spike an idea with throwaway experiments to validate feasibility before planning
+argument-hint: "<idea to validate> [--quick]"
+allowed-tools:
+  - Read
+  - Write
+  - Edit
+  - Bash
+  - Grep
+  - Glob
+  - AskUserQuestion
+---
+<objective>
+Rapid feasibility validation through focused, throwaway experiments. Each spike answers one
+specific question with observable evidence. Spikes live in `.planning/spikes/` and integrate
+with GSD commit patterns, state tracking, and handoff workflows.
+
+Does not require `/gsd-new-project` — auto-creates `.planning/spikes/` if needed.
+</objective>
+
+<execution_context>
+@~/.claude/get-shit-done/workflows/spike.md
+@~/.claude/get-shit-done/references/ui-brand.md
+</execution_context>
+
+<runtime_note>
+**Copilot (VS Code):** Use `vscode_askquestions` wherever this workflow calls `AskUserQuestion`.
+</runtime_note>
+
+<context>
+Idea: $ARGUMENTS
+
+**Available flags:**
+- `--quick` — Skip decomposition/alignment, jump straight to building. Use when you already know what to spike.
+</context>
+
+<process>
+Execute the spike workflow from @~/.claude/get-shit-done/workflows/spike.md end-to-end.
+Preserve all workflow gates (decomposition, risk ordering, verification, MANIFEST updates, commit patterns).
+</process>