fix: sync spike/sketch workflows with upstream skill improvements

Spike workflow:
- Add prior spike check — skips already-validated questions
- Add comparison spikes (NNN-a/NNN-b) for head-to-head evaluation
- Add research-before-building step (context7 + web search)
- Add forensic logging/observability for runtime-interactive spikes
- Add Type column to MANIFEST, type/Research/Observability to README

Sketch workflow:
- Add research-the-target-stack step — check component availability,
  framework constraints, and idiomatic patterns before building

Spike wrap-up workflow:
- Replace per-spike curation with auto-include-all (every spike carries
  signal: VALIDATED=patterns, PARTIAL=constraints, INVALIDATED=landmines)
- Add Step 10 intelligent routing — integration spike candidates,
  frontier spike candidates, and standard next-step options

Commands updated with context7/WebSearch tools and --text flag.

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

commands/gsd/spike-wrap-up.md

@@ -27,5 +27,5 @@ project history. Output skill goes to `./.claude/skills/spike-findings-[project]
 
 <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).
+Preserve all workflow gates (auto-include, feature-area grouping, skill synthesis, CLAUDE.md routing line, intelligent next-step routing).
 </process>