feat(commands): add /gsd-explore for Socratic ideation and idea routing (#1813)

* feat(commands): add /gsd-explore for Socratic ideation and idea routing

Open-ended exploration command that guides developers through ideas via
Socratic questioning, optionally spawns research when factual questions
surface, then routes crystallized outputs to appropriate GSD artifacts
(notes, todos, seeds, research questions, requirements, or new phases).

Conversation follows questioning.md principles — one question at a time,
contextual domain probes, natural flow. Outputs require explicit user
selection before writing.

Closes #1729

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* fix(commands): address review feedback on explore command (#1729)

- Change allowed-tools from Agent to Task to match subagent spawn pattern
- Remove unresolved {resolved_model} placeholder from Task spawn

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

---------

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

commands/gsd/explore.md

@@ -0,0 +1,27 @@
+---
+name: gsd:explore
+description: Socratic ideation and idea routing — think through ideas before committing to plans
+allowed-tools:
+  - Read
+  - Write
+  - Bash
+  - Grep
+  - Glob
+  - Task
+  - AskUserQuestion
+---
+<objective>
+Open-ended Socratic ideation session. Guides the developer through exploring an idea via
+probing questions, optionally spawns research, then routes outputs to the appropriate GSD
+artifacts (notes, todos, seeds, research questions, requirements, or new phases).
+
+Accepts an optional topic argument: `/gsd-explore authentication strategy`
+</objective>
+
+<execution_context>
+@~/.claude/get-shit-done/workflows/explore.md
+</execution_context>
+
+<process>
+Execute the explore workflow from @~/.claude/get-shit-done/workflows/explore.md end-to-end.
+</process>