Document finite timeout and polling constraints

Co-authored-by: Shri Sukhani <shrisukhani@users.noreply.github.com>

Author: cursoragent

README.md

@@ -62,7 +62,7 @@ with Hyperbrowser(
 ```
 
 > If you pass `config=...`, do not also pass `api_key`, `base_url`, or `headers`.
-> `timeout` may be provided to client constructors and must be non-negative (`None` disables request timeouts).
+> `timeout` may be provided to client constructors and must be finite and non-negative (`None` disables request timeouts).
 
 ## Clients
 
@@ -124,6 +124,8 @@ These methods now support explicit polling controls:
 - `max_wait_seconds` (default `600.0`)
 - `max_status_failures` (default `5`)
 
+Timing values must be finite, non-negative numbers.
+
 Example:
 
 ```python