refactor: enforce mandatory brackets for composite values

Implements Phase 1 and 2 of the syntax rework plan:
- Brackets `[]` are now mandatory for all tuple and array values.
- Removed the `[Type][]` array syntax; arrays now only use `Type[]`.
- `[single]` is now strictly a 1-tuple rather than an array.
- Updated documentation and test fixtures to reflect these breaking
  changes.

README.md

@@ -35,14 +35,9 @@ numberSchema.validator(name);    // false
 ```typescript
 const tupleSchema = defineSchema('[string; number; boolean]');
 
-// With brackets
 const value1 = tupleSchema.parse('[hello; 42; true]');
 // ["hello", 42, true]
 
-// Without brackets (outermost brackets are optional)
-const value2 = tupleSchema.parse('hello; 42; true');
-// ["hello", 42, true]
-
 tupleSchema.validator(value1);    // true
 tupleSchema.validator(['a', 'b', true]);  // false (second element should be number)
 ```
@@ -50,16 +45,11 @@ tupleSchema.validator(['a', 'b', true]);  // false (second element should be num
 ### Arrays
 
 ```typescript
-// Array syntax: Type[] or [Type][]
+// Array syntax: Type[]
 const stringArray = defineSchema('string[]');
-const numberArray = defineSchema('[number][]');
+const numberArray = defineSchema('number[]');
 
-// With brackets
-const names1 = stringArray.parse('[alice; bob; charlie]');
-// ["alice", "bob", "charlie"]
-
-// Without brackets (outermost brackets are optional)
-const names2 = stringArray.parse('alice; bob; charlie');
+const names = stringArray.parse('[alice; bob; charlie]');
 // ["alice", "bob", "charlie"]
 
 const numbers = numberArray.parse('[1; 2; 3; 4; 5]');
@@ -71,12 +61,7 @@ const numbers = numberArray.parse('[1; 2; 3; 4; 5]');
 ```typescript
 const schema = defineSchema('[string; number][]');
 
-// With outer brackets
-const data1 = schema.parse('[[a; 1]; [b; 2]; [c; 3]]');
-// [["a", 1], ["b", 2], ["c", 3]]
-
-// Without outer brackets
-const data2 = schema.parse('[a; 1]; [b; 2]; [c; 3]');
+const data = schema.parse('[[a; 1]; [b; 2]; [c; 3]]');
 // [["a", 1], ["b", 2], ["c", 3]]
 ```
 
@@ -155,9 +140,9 @@ The following TypeScript types are exported:
 | Float | `float` | `3.14` |
 | Number | `number` | `42` or `3.14` |
 | Boolean | `boolean` | `true` or `false` |
-| Tuple | `[Type1; Type2; ...]` | `[hello; 42; true]` or `hello; 42; true` |
-| Array | `Type[]` or `[Type][]` | `[1; 2; 3]` or `1; 2; 3` |
-| Array of Tuples | `[Type1; Type2][]` | `[[a; 1]; [b; 2]]` or `[a; 1]; [b; 2]` |
+| Tuple | `[Type1; Type2; ...]` | `[hello; 42; true]` |
+| Array | `Type[]` | `[1; 2; 3]` |
+| Array of Tuples | `[Type1; Type2][]` | `[[a; 1]; [b; 2]]` |
 | Union | `Type1 \| Type2` | `hello` or `42` (matches first valid member) |
 | String Literal | `'on' \| 'off'` or `"red"` | `on` or `off` |
 | Reference | `@tablename` or `@tablename[]` | (resolved at CSV load time) |
@@ -166,7 +151,8 @@ The following TypeScript types are exported:
 ## Notes
 
 - Semicolons `;` are used as separators instead of commas `,`
-- Outermost brackets `[]` are optional for tuple and array values
+- Tuple and array values **must** be wrapped in brackets `[]` (e.g. `[a; b]`)
+- `[single]` is a 1-tuple, not an array — use `Type[]` for arrays
 - Special characters can be escaped with backslash: `\;`, `\[`, `\]`, `\\`
 - Empty arrays/tuples are not allowed
 - For CSV loading with reference resolution, see [csv-loader.md](./csv-loader.md)