provider: bump stream-read watchdog from 90s to 180s

ober

b73a42b6df95630d490a742dfe194bfa3e9d96de

diff --git a/src/jcode/provider/provider.ss b/src/jcode/provider/provider.ss
index 00c9cb0..4dfcd0c 100644
--- a/src/jcode/provider/provider.ss
+++ b/src/jcode/provider/provider.ss
@@ -349,7 +349,7 @@
 ;; watchdog thread closes the connection so the read loop unblocks and we
 ;; raise a clear error instead of hanging indefinitely. Override at runtime
 ;; via (parameterize ((*stream-read-timeout-secs* N)) ...).
-(def *stream-read-timeout-secs* (make-parameter 90))
+(def *stream-read-timeout-secs* (make-parameter 180))
 
 ;; Streaming HTTP POST: calls line-cb with each line of the response body.
 ;; Used for SSE (Server-Sent Events) streaming from LLM APIs.