diff --git a/.planning/ROADMAP.md b/.planning/ROADMAP.md
index 188a685..285687a 100644
--- a/.planning/ROADMAP.md
+++ b/.planning/ROADMAP.md
@@ -15,6 +15,7 @@ None
 - Decimal phases (2.1, 2.2): Urgent insertions (marked with INSERTED)
 
 - [x] **Phase 1: Core Infrastructure** - CLI binary, server mode, process lifecycle, graceful shutdown
+- [ ] **Phase 1.1: Hexagonal Architecture** (INSERTED) - Tests, events, ports/adapters, tRPC
 - [ ] **Phase 2: Data Layer** - SQLite database with task hierarchy schema
 - [ ] **Phase 3: Git Integration** - Worktree isolation per agent with proper lifecycle
 - [ ] **Phase 4: Agent Lifecycle** - Spawn, stop, list agents with session persistence
@@ -38,6 +39,26 @@ Plans:
 - [x] 01-04: Logging Infrastructure (Wave 2)
 - [x] 01-05: Coordination Server & Shutdown (Wave 3)
 
+### Phase 1.1: Hexagonal Architecture (INSERTED)
+**Goal**: Retrofit Phase 1 with hexagonal architecture, event-based inter-module communication, unit/integration tests, and tRPC for client communication
+**Depends on**: Phase 1
+**Requirements**: None (architectural refactor)
+**Research**: Unlikely (patterns well-documented)
+**Plans**: 6 plans in 3 waves
+
+Plans:
+- [ ] 01.1-01: Event Bus Foundation (Wave 1)
+- [ ] 01.1-02: tRPC Foundation (Wave 1)
+- [ ] 01.1-03: Process Module Tests + Events (Wave 2)
+- [ ] 01.1-04: Logging Module Tests + Events (Wave 2)
+- [ ] 01.1-05: Server Module Tests + Events (Wave 2)
+- [ ] 01.1-06: CLI tRPC Integration (Wave 3)
+
+**Scope:**
+- Unit + integration tests for existing Phase 1 code
+- Event bus for inter-module communication (extensible, swappable for external systems)
+- tRPC router for server-to-client communication (CLI, future WebUI)
+
 ### Phase 2: Data Layer
 **Goal**: SQLite database with Drizzle ORM, task hierarchy schema (initiative → phase → plan → task)
 **Depends on**: Phase 1
@@ -108,11 +129,12 @@ Plans:
 ## Progress
 
 **Execution Order:**
-Phases execute in numeric order: 1 → 2 → 3 → 4 → 5 → 6 → 7
+Phases execute in numeric order: 1 → 1.1 → 2 → 3 → 4 → 5 → 6 → 7
 
 | Phase | Plans Complete | Status | Completed |
 |-------|----------------|--------|-----------|
 | 1. Core Infrastructure | 5/5 | Complete | 2026-01-30 |
+| 1.1. Hexagonal Architecture | 0/6 | Planned | - |
 | 2. Data Layer | 0/? | Not started | - |
 | 3. Git Integration | 0/? | Not started | - |
 | 4. Agent Lifecycle | 0/? | Not started | - |
diff --git a/.planning/STATE.md b/.planning/STATE.md
index 5b00ccb..0111234 100644
--- a/.planning/STATE.md
+++ b/.planning/STATE.md
@@ -5,14 +5,14 @@
 See: .planning/PROJECT.md (updated 2026-01-30)
 
 **Core value:** Coordinate multiple Claude Code agents without losing track or stepping on each other.
-**Current focus:** Phase 1 — Core Infrastructure
+**Current focus:** Phase 1.1 — Hexagonal Architecture (INSERTED)
 
 ## Current Position
 
-Phase: 1 of 7 (Core Infrastructure)
-Plan: 5 of 5 in current phase
-Status: Phase complete
-Last activity: 2026-01-30 — Completed 01-05-PLAN.md
+Phase: 1.1 of 8 (Hexagonal Architecture - INSERTED)
+Plan: 0 of 6 in current phase
+Status: Planned (6 plans in 3 waves)
+Last activity: 2026-01-30 — Planned Phase 1.1
 
 Progress: ██████████ 71%
 
@@ -49,6 +49,12 @@ Recent decisions affecting current work:
 
 None yet.
 
+### Roadmap Evolution
+
+- Phase 1.1 inserted after Phase 1: Hexagonal architecture with events, tests, and tRPC (URGENT)
+  - Retrofits Phase 1 code before continuing to Phase 2
+  - Establishes architectural foundation for rest of project
+
 ### Blockers/Concerns
 
 None yet.