fix(execute): restore offer_next routing to orchestrator commands

The orchestrator pattern conversion (8ed6a8f) removed workflow context
loading for context efficiency but inadvertently removed the offer_next
step that presents copy/paste-ready next commands after plan/phase
completion.

Added explicit <offer_next> sections to both commands:
- execute-plan.md: routes to next plan, next phase, or milestone complete
- execute-phase.md: routes to next phase or milestone complete

Both include /clear hints and copy/paste-ready command paths.

Fixes #69

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

commands/gsd/execute-phase.md

@@ -64,10 +64,83 @@ Phase: $ARGUMENTS
    - Update ROADMAP.md
 
 6. **Offer next steps**
-   - More phases → `/gsd:plan-phase {next}`
-   - Milestone complete → `/gsd:complete-milestone`
+   - Route to next action (see `<offer_next>`)
 </process>
 
+<offer_next>
+**MANDATORY: Present copy/paste-ready next command.**
+
+After phase completes, determine what's next:
+
+**Step 1: Check milestone status**
+
+Read ROADMAP.md. Find current phase number and highest phase in milestone.
+
+| Condition | Action |
+|-----------|--------|
+| current < highest | More phases → Route A |
+| current = highest | Milestone complete → Route B |
+
+---
+
+**Route A: More phases remain in milestone**
+
+```
+## ✓ Phase {Z}: {Name} Complete
+
+All {Y} plans finished.
+
+---
+
+## ▶ Next Up
+
+**Phase {Z+1}: {Name}** — {Goal from ROADMAP.md}
+
+`/gsd:plan-phase {Z+1}`
+
+<sub>`/clear` first → fresh context window</sub>
+
+---
+
+**Also available:**
+- `/gsd:verify-work {Z}` — manual acceptance testing before continuing
+- `/gsd:discuss-phase {Z+1}` — gather context first
+- `/gsd:research-phase {Z+1}` — investigate unknowns
+
+---
+```
+
+---
+
+**Route B: Milestone complete**
+
+```
+🎉 MILESTONE COMPLETE!
+
+## ✓ Phase {Z}: {Name} Complete
+
+All {N} phases finished.
+
+---
+
+## ▶ Next Up
+
+**Complete Milestone** — archive and prepare for next
+
+`/gsd:complete-milestone`
+
+<sub>`/clear` first → fresh context window</sub>
+
+---
+
+**Also available:**
+- `/gsd:verify-work` — manual acceptance testing before completing milestone
+- `/gsd:add-phase <description>` — add another phase before completing
+
+---
+```
+</offer_next>
+
 <wave_execution>
 **Parallel spawning:**
 

commands/gsd/execute-plan.md

@@ -85,12 +85,111 @@ Plan path: $ARGUMENTS
    - If contains "## CHECKPOINT REACHED": Execute checkpoint_handling
    - If contains "## PLAN COMPLETE": Verify SUMMARY exists, report success
 
-7. **Report completion**
+7. **Report completion and offer next steps**
    - Show SUMMARY path
    - Show commits from subagent return
-   - Offer next steps
+   - Route to next action (see `<offer_next>`)
 </process>
 
+<offer_next>
+**MANDATORY: Present copy/paste-ready next command.**
+
+After plan completes, determine what's next:
+
+**Step 1: Count plans vs summaries in current phase**
+```bash
+ls -1 .planning/phases/[phase-dir]/*-PLAN.md 2>/dev/null | wc -l
+ls -1 .planning/phases/[phase-dir]/*-SUMMARY.md 2>/dev/null | wc -l
+```
+
+**Step 2: Route based on counts**
+
+| Condition | Action |
+|-----------|--------|
+| summaries < plans | More plans remain → Route A |
+| summaries = plans | Phase complete → Check milestone (Step 3) |
+
+---
+
+**Route A: More plans remain in phase**
+
+Find next PLAN.md without matching SUMMARY.md. Present:
+
+```
+Plan {phase}-{plan} complete.
+Summary: .planning/phases/{phase-dir}/{phase}-{plan}-SUMMARY.md
+
+{Y} of {X} plans complete for Phase {Z}.
+
+---
+
+## ▶ Next Up
+
+**{phase}-{next-plan}: [Plan Name]** — [objective from PLAN.md]
+
+`/gsd:execute-plan .planning/phases/{phase-dir}/{phase}-{next-plan}-PLAN.md`
+
+<sub>`/clear` first → fresh context window</sub>
+
+---
+```
+
+---
+
+**Step 3: Check milestone status (only when phase complete)**
+
+Read ROADMAP.md. Find current phase number and highest phase in milestone.
+
+| Condition | Action |
+|-----------|--------|
+| current < highest | More phases → Route B |
+| current = highest | Milestone complete → Route C |
+
+---
+
+**Route B: Phase complete, more phases remain**
+
+```
+## ✓ Phase {Z}: {Name} Complete
+
+All {Y} plans finished.
+
+---
+
+## ▶ Next Up
+
+**Phase {Z+1}: {Name}** — {Goal from ROADMAP.md}
+
+`/gsd:plan-phase {Z+1}`
+
+<sub>`/clear` first → fresh context window</sub>
+
+---
+```
+
+---
+
+**Route C: Milestone complete**
+
+```
+🎉 MILESTONE COMPLETE!
+
+## ✓ Phase {Z}: {Name} Complete
+
+All {N} phases finished.
+
+---
+
+## ▶ Next Up
+
+`/gsd:complete-milestone`
+
+<sub>`/clear` first → fresh context window</sub>
+
+---
+```
+</offer_next>
+
 <checkpoint_handling>
 When subagent returns with checkpoint: