refactor: Rename agent modes breakdown→plan, decompose→detail

Full rename across the codebase for clarity:
- breakdown (initiative→phases) is now "plan"
- decompose (phase→tasks) is now "detail"

Updates schema enums, TypeScript types, events, prompts, output handler,
tRPC procedures, CLI commands, frontend components, tests, and docs.
Also fixes 0022 migration multi-statement issue (adds statement-breakpoint markers).

docs/frontend.md

@@ -63,7 +63,7 @@ The initiative detail page has three tabs managed via local state (not URL param
 |-----------|---------|
 | `ExecutionTab` | Main execution view container |
 | `ExecutionContext` | React context for execution state |
-| `PhaseDetailPanel` | Phase detail with tasks, dependencies, breakdown |
+| `PhaseDetailPanel` | Phase detail with tasks, dependencies, plan |
 | `PhaseSidebar` | Phase list sidebar |
 | `TaskDetailPanel` | Task detail with agent status, output |
 
@@ -88,7 +88,7 @@ shadcn/ui components: badge, button, card, dialog, dropdown-menu, input, label,
 | Hook | Purpose |
 |------|---------|
 | `useRefineAgent` | Manages refine agent lifecycle for initiative |
-| `useDecomposeAgent` | Manages decompose agent for phase breakdown |
+| `useDetailAgent` | Manages detail agent for phase planning |
 | `useAgentOutput` | Subscribes to live agent output stream |
 
 ## tRPC Client
@@ -120,9 +120,9 @@ Configured in `src/lib/trpc.ts`. Uses `@trpc/react-query` with TanStack Query fo
 3. Approve phases → queue for dispatch
 4. Tasks auto-queued when phase starts
 
-### Decomposing Phases
-1. Select phase → "Breakdown" button
-2. `spawnArchitectDecompose` mutation → agent creates task proposals
+### Detailing Phases
+1. Select phase → "Detail" button
+2. `spawnArchitectDetail` mutation → agent creates task proposals
 3. Accept proposals → tasks created under phase
 4. View tasks in phase detail panel