docs(05): mark Phase 5 complete — validation code already implemented

.planning/phases/05-model-source-validation/05-VERIFICATION.md

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+status: passed
+phase: 5
+name: Model Source Validation
+date: 2026-04-02
+
+## Verification Summary
+
+All Phase 5 success criteria are met by existing implementation.
+
+## Success Criteria Verification
+
+### 1. User can choose a runtime or model source and only see model options valid for the current source and mode.
+- ✓ `validateSourceMode()` in runtime-utils.ts validates source/mode combinations
+- ✓ Field validations block invalid combinations before apply
+- ✓ useRuntimeManager integrates validation on every draft state change
+
+### 2. User can select managed library and models folder locations and receive validation before saving.
+- ✓ `validateModelsDirectory()` validates directory paths async
+- ✓ `validateModelPath()` validates model file paths
+- ✓ Validation runs before draft is applied to live state
+
+### 3. User can recover from invalid model-source or path combinations by following inline validation guidance before applying the change.
+- ✓ Field-level validation errors displayed inline in RuntimeSettingsDrawer
+- ✓ Apply button blocked when validation errors exist
+- ✓ Recovery guidance shown per field
+
+## Implementation Evidence
+
+- `tauri-app/src/features/runtime/runtime-utils.ts` — validateSourceMode, validateModelPath, validateModelsDirectory, validateModelFile
+- `tauri-app/src/features/runtime/useRuntimeManager.ts` — validation integrated at lines 79-82, 203-208, 236-239
+- `tauri-app/src/features/runtime/types.ts` — validation types defined
+
+## Notes
+
+Phase 5 implementation was completed as part of Phase 4 work. The phase directory was missing but all code artifacts are present and verified.