Valid Bracket Sequence

Question

Given a string containing only `(`, `)`, `[`, `]`, `{`, and `}`, determine whether every opener is closed by the matching type in the correct order.

```python
def is_valid_bracket_sequence(text: str) -> bool: ...
```

The empty string is valid. A closing bracket with no pending opener is invalid, as is any opener left at the end. Target `O(n)` time and `O(n)` worst-case space.

## Staged follow-ups

1. Ignore brackets inside quoted strings while respecting escape characters.
2. Report the location and expected token for the first mismatch.
3. Validate a stream incrementally across chunk boundaries.