fix(next-steps): remove /gsd:research-phase from workflow suggestions

Research is now integrated into /gsd:plan-phase by default.
Remove standalone research command from "Also available" sections.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

commands/gsd/create-roadmap.md

@@ -119,7 +119,6 @@ Roadmap created:
 
 **Also available:**
 - `/gsd:discuss-phase 1` — gather context first
-- `/gsd:research-phase 1` — investigate unknowns
 - Review roadmap
 
 ---

commands/gsd/progress.md

@@ -201,7 +201,6 @@ Check if `{phase}-CONTEXT.md` exists in phase directory.
 
 **Also available:**
 - `/gsd:discuss-phase {phase}` — gather context first
-- `/gsd:research-phase {phase}` — investigate unknowns
 - `/gsd:list-phase-assumptions {phase}` — see Claude's assumptions
 
 ---
@@ -276,7 +275,6 @@ Read ROADMAP.md to get the next phase's name and goal.
 **Also available:**
 - `/gsd:verify-work {Z}` — user acceptance test before continuing
 - `/gsd:discuss-phase {Z+1}` — gather context first
-- `/gsd:research-phase {Z+1}` — investigate unknowns
 
 ---
 ```