docs(09.1): insert modular sub-workflows phase

- Add Phase 9.1 between Phase 9 and Phase 10
- Update Phase 10 dependency to Phase 9.1
- Create phase directory structure

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

.planning/ROADMAP.md

@@ -104,11 +104,29 @@ Plans:
 
 ---
 
+### Phase 9.1: Explore Breaking Main Workflow into Modular Sub-Workflows (INSERTED)
+
+**Goal:** [Urgent work - to be planned]
+
+**Dependencies:** Phase 9 (batch operations complete before modularization)
+
+**Requirements:** TBD
+
+**Plans:** 0 plans
+
+Plans:
+- [ ] TBD (run /gsd:plan-phase 9.1 to break down)
+
+**Success Criteria:**
+[To be defined during planning]
+
+---
+
 ### Phase 10: Polish & Audit
 
 **Goal:** Clear Unraid update badges, fix webhook issues, and verify environment configuration
 
-**Dependencies:** Phase 9 (core features complete before polish)
+**Dependencies:** Phase 9.1 (workflow modularization complete before polish)
 
 **Requirements:** UNR-01, ENV-01, ENV-02, WEB-01
 
@@ -146,6 +164,7 @@ Plans:
 | 7 | Socket Security | SEC-01, SEC-02, SEC-03, SEC-04 | Complete |
 | 8 | Inline Keyboard Infrastructure | KEY-01, KEY-02, KEY-03, KEY-04, KEY-05 | Complete |
 | 9 | Batch Operations | BAT-01, BAT-02, BAT-03, BAT-04, BAT-05, BAT-06 | Pending |
+| 9.1 | Explore Modular Sub-Workflows | TBD | Pending |
 | 10 | Polish & Audit | UNR-01, ENV-01, ENV-02, WEB-01 | Pending |
 | 11 | Documentation Overhaul | TBD | Pending |