Function isValidUri

isValidUri(uri: string): boolean
Validates that a string is a properly formatted URI
Parameters
- uri: string
  String to validate
Returns boolean
True if the string is a valid URI format
Example
```
isValidUri("tag:example.com,2025:agent1"); // true
isValidUri("https://example.com/agent"); // true
isValidUri("not-a-uri"); // false
```
- Defined in utils.ts:179