docs + AGENTS: no-implementation rule, issue-driven workflow, Vico, Uncategorized, ClearAllData, AddEditRecurringScreen

- AGENTS.md: add No-implementation rule and Issue-driven workflow section
- docs/01: rename default fallback category from 'Other' to 'Uncategorized'
- docs/02, 03: update 'Other' references to 'Uncategorized' in delete/seed/default flows
- docs/04: replace Canvas charts with Vico 2.x dep, add data feature folder, add AddEditRecurringScreen, document tab-aware FAB and shared ExportAction helper

docs/02-interfaces.md

@@ -68,7 +68,7 @@ class GetCategories(dao: CategoryDao) {
     fun subscribeAll(): Flow<List<Category>>
     suspend fun awaitOne(id: Long): Category?
     suspend fun awaitAll(): List<Category>
-    suspend fun awaitDefault(): Category  // returns the isDefault=true "Other" category
+    suspend fun awaitDefault(): Category  // returns the isDefault=true "Uncategorized" category
 }
 ```
 
@@ -87,7 +87,7 @@ class DeleteCategory(
     getCategories: GetCategories,
 ) {
     suspend fun await(id: Long)
-    // internally: reassign orphaned expenses to "Other", then delete
+    // internally: reassign orphaned expenses to "Uncategorized", then delete
 }
 ```
 
@@ -183,3 +183,16 @@ class ExportExpensesToCsv(expenseDao: ExpenseDao, categoryDao: CategoryDao, cont
     suspend fun await(range: DateRange, outputUri: Uri): Result<Unit>
 }
 ```
+
+---
+
+## Feature: data
+
+Wipe-all-data administrative action. Triggered from `SettingsScreen` "Clear all data" `AlertDialogPreference`.
+
+### `ClearAllData`
+```kotlin
+class ClearAllData(database: AppDatabase) {
+    suspend fun await()   // deletes all rows from every table
+}
+```