Raise --predict default to 32768 and document that it is not a cap

Measured: with --predict 8192 a request sending max_tokens=9000 returned
8893 tokens (finish_reason stop), while a request sending no max_tokens was
cut at exactly 8192 (finish_reason length). The flag is a default for
clients that omit max_tokens, not a ceiling anyone can hit.

That default still matters on a -np 1 server, where an unbounded client
would fill the 128k window and block the only slot for ~50 minutes. 32768
bounds that to ~12 minutes without truncating realistic long answers, which
8192 was doing silently to any client that omits max_tokens.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

docker-compose.yml

@@ -51,8 +51,12 @@ services:
       - -np
       - "1"
       - --no-mmap
+      # Default only, NOT a ceiling: a client sending max_tokens overrides it
+      # (verified — max_tokens=9000 returned 8893 tokens against --predict 8192).
+      # It bounds clients that send no max_tokens at all, which would otherwise
+      # generate until the 128k window is full: ~50 min blocking the single slot.
       - --predict
-      - "8192"
+      - "32768"
       - --reasoning-budget
       - "4096"
       - --slot-save-path