feat(09-02): add plan-fix command and progress routing for UAT issues

- Create plan-fix command to generate FIX.md from ISSUES.md
- Add Route E to progress.md for detecting unaddressed UAT issues
- Add verify-work and plan-fix to README commands table
- Credit OracleGreyBeard for verify-work contribution

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

README.md

@@ -302,6 +302,8 @@ You're never locked in. The system adapts.
 | `/gsd:plan-phase [N]`             | Generate task plans for phase                                 |
 | `/gsd:execute-plan`               | Run plan via subagent                                         |
 | `/gsd:progress`                   | Where am I? What's next?                                      |
+| `/gsd:verify-work [N]`*           | User acceptance test of phase or plan                         |
+| `/gsd:plan-fix [plan]`            | Plan fixes for UAT issues from verify-work                    |
 | `/gsd:complete-milestone`         | Ship it, prep next version                                    |
 | `/gsd:discuss-milestone`          | Gather context for next milestone                             |
 | `/gsd:new-milestone [name]`       | Create new milestone with phases                              |
@@ -316,6 +318,8 @@ You're never locked in. The system adapts.
 | `/gsd:consider-issues`            | Review deferred issues, close resolved, identify urgent       |
 | `/gsd:help`                       | Show all commands and usage guide                             |
 
+*Contributed by reddit user OracleGreyBeard
+
 ---
 
 ## Troubleshooting