feat: /gsd:ship command for PR creation from verified phase work (#829) (#1123)

* feat: /gsd:ship command for PR creation from verified phase work (#829)

New command that bridges local completion → merged PR, closing the
plan → execute → verify → ship loop.

Workflow (workflows/ship.md):
1. Preflight: verification passed, clean tree, correct branch, gh auth
2. Push branch to remote
3. Auto-generate rich PR body from planning artifacts:
   - Phase goal from ROADMAP.md
   - Changes from SUMMARY.md files
   - Requirements addressed (REQ-IDs)
   - Verification status
   - Key decisions
4. Create PR via gh CLI (supports --draft)
5. Optional code review request
6. Update STATE.md with shipping status

Files:
- commands/gsd/ship.md: New command entry point
- get-shit-done/workflows/ship.md: Full workflow implementation
- get-shit-done/workflows/help.md: Add ship to help output
- docs/COMMANDS.md: Command reference
- docs/FEATURES.md: Feature spec with REQ-SHIP-01 through 05
- docs/USER-GUIDE.md: Add to command table
- CHANGELOG.md: Document new command

Fixes #829

* fix(tests): update expected skill count from 39 to 40 for new ship command

The Copilot install E2E tests hardcode the expected number of skill
directories and manifest entries. Adding commands/gsd/ship.md increased
the count from 39 to 40.

docs/USER-GUIDE.md

@@ -284,6 +284,7 @@ Controlled by `workflow.ui_safety_gate` config toggle.
 | `/gsd:plan-phase [N]` | Research + plan + verify | Before executing a phase |
 | `/gsd:execute-phase <N>` | Execute all plans in parallel waves | After planning is complete |
 | `/gsd:verify-work [N]` | Manual UAT with auto-diagnosis | After execution completes |
+| `/gsd:ship [N]` | Create PR from verified work | After verification passes |
 | `/gsd:ui-review [N]` | Retroactive 6-pillar visual audit | After execution or verify-work (frontend projects) |
 | `/gsd:audit-milestone` | Verify milestone met its definition of done | Before completing milestone |
 | `/gsd:complete-milestone` | Archive milestone, tag release | All phases verified |
@@ -363,7 +364,7 @@ GSD stores project settings in `.planning/config.json`. Configure during `/gsd:n
 |---------|---------|---------|------------------|
 | `mode` | `interactive`, `yolo` | `interactive` | `yolo` auto-approves decisions; `interactive` confirms at each step |
 | `granularity` | `coarse`, `standard`, `fine` | `standard` | Phase granularity: how finely scope is sliced (3-5, 5-8, or 8-12 phases) |
-| `model_profile` | `quality`, `balanced`, `budget`, `inherit` | `balanced` | Model tier for each agent (see table below) |
+| `model_profile` | `quality`, `balanced`, `budget`, `inherit` | `balanced` | Model tier for each agent (see table below) |
 
 ### Planning Settings
 
@@ -407,25 +408,25 @@ Disable these to speed up phases in familiar domains or when conserving tokens.
 
 ### Model Profiles (Per-Agent Breakdown)
 
-| Agent | `quality` | `balanced` | `budget` | `inherit` |
-|-------|-----------|------------|----------|-----------|
-| gsd-planner | Opus | Opus | Sonnet | Inherit |
-| gsd-roadmapper | Opus | Sonnet | Sonnet | Inherit |
-| gsd-executor | Opus | Sonnet | Sonnet | Inherit |
-| gsd-phase-researcher | Opus | Sonnet | Haiku | Inherit |
-| gsd-project-researcher | Opus | Sonnet | Haiku | Inherit |
-| gsd-research-synthesizer | Sonnet | Sonnet | Haiku | Inherit |
-| gsd-debugger | Opus | Sonnet | Sonnet | Inherit |
-| gsd-codebase-mapper | Sonnet | Haiku | Haiku | Inherit |
-| gsd-verifier | Sonnet | Sonnet | Haiku | Inherit |
-| gsd-plan-checker | Sonnet | Sonnet | Haiku | Inherit |
-| gsd-integration-checker | Sonnet | Sonnet | Haiku | Inherit |
+| Agent | `quality` | `balanced` | `budget` | `inherit` |
+|-------|-----------|------------|----------|-----------|
+| gsd-planner | Opus | Opus | Sonnet | Inherit |
+| gsd-roadmapper | Opus | Sonnet | Sonnet | Inherit |
+| gsd-executor | Opus | Sonnet | Sonnet | Inherit |
+| gsd-phase-researcher | Opus | Sonnet | Haiku | Inherit |
+| gsd-project-researcher | Opus | Sonnet | Haiku | Inherit |
+| gsd-research-synthesizer | Sonnet | Sonnet | Haiku | Inherit |
+| gsd-debugger | Opus | Sonnet | Sonnet | Inherit |
+| gsd-codebase-mapper | Sonnet | Haiku | Haiku | Inherit |
+| gsd-verifier | Sonnet | Sonnet | Haiku | Inherit |
+| gsd-plan-checker | Sonnet | Sonnet | Haiku | Inherit |
+| gsd-integration-checker | Sonnet | Sonnet | Haiku | Inherit |
 
 **Profile philosophy:**
-- **quality** -- Opus for all decision-making agents, Sonnet for read-only verification. Use when quota is available and the work is critical.
-- **balanced** -- Opus only for planning (where architecture decisions happen), Sonnet for everything else. The default for good reason.
-- **budget** -- Sonnet for anything that writes code, Haiku for research and verification. Use for high-volume work or less critical phases.
-- **inherit** -- All agents use the current session model. Best when switching models dynamically (for example OpenCode `/model`).
+- **quality** -- Opus for all decision-making agents, Sonnet for read-only verification. Use when quota is available and the work is critical.
+- **balanced** -- Opus only for planning (where architecture decisions happen), Sonnet for everything else. The default for good reason.
+- **budget** -- Sonnet for anything that writes code, Haiku for research and verification. Use for high-volume work or less critical phases.
+- **inherit** -- All agents use the current session model. Best when switching models dynamically (for example OpenCode `/model`).
 
 ---