Add 5 pi extensions: pi-subagents, pi-crew, rpiv-pi, pi-interactive-shell, pi-intercom

extensions/rpiv-pi/skills/annotate-guidance/examples/subfolder-schemas-layer.md

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+# Schemas Layer Architecture
+
+## Responsibility
+Zod validation schemas for dual-layer validation (preload UX + main security), type inference via z.infer<>.
+
+## Dependencies
+- **zod**: Runtime validation
+
+## Consumers
+- **@redis-ui/ipc**: Main process validation (security)
+- **Preload**: Fail-fast validation (UX)
+- **TypeScript**: Type inference
+
+## Module Structure
+```
+src/
+├── connection.ts, backup.ts    # Domain schemas
+└── __tests__/                  # Validation tests
+```
+
+## Complete Schema Pattern (Types + Validation + Composition)
+
+```typescript
+export const createConnectionSchema = z.object({
+  name: z.string().min(1).max(255),
+  host: z.string().min(1),
+  port: z.number().int().min(1).max(65535),
+  password: z.string().optional(),
+  database: z.number().int().min(0).max(15).default(0),
+})
+
+// Type inference
+export type CreateConnectionInput = z.infer<typeof createConnectionSchema>
+
+// Update schema (partial + ID required)
+export const updateConnectionSchema = createConnectionSchema.partial().extend({
+  id: z.string().min(1)
+})
+```
+
+## Dual-Validation Flow
+
+```
+Renderer input → Preload (Zod parse, fail fast) → IPC → Main (Zod parse again, security)
+```
+
+## Architectural Boundaries
+- **NO any types**: Use z.unknown()
+- **NO skipping validation**: Always validate at boundaries
+- **NO business logic**: Structure validation only