fix: remove max-turns limit from claude-code-action workflows

Removing the --max-turns restriction to allow Claude to complete
its tasks without being artificially limited. The previous 3-turn
limit was causing workflows to hit error_max_turns before completing.

Both pr-assignment-check and pr-stale-check workflows now have
unlimited turns.

Author: maxprilutskiy

.github/workflows/pr-assignment-check.yml

@@ -41,5 +41,4 @@ jobs:
 
             If no issues referenced or PR author is properly assigned, do nothing.
           claude_args: |
-            --max-turns 3
             --allowedTools "Bash,Read,Grep,Glob"

.github/workflows/pr-stale-check.yml

@@ -46,5 +46,4 @@ jobs:
             4. Close message template (friendly, concise, no emojis):
                "Closing this PR as stale to keep the repo clean. Feel free to reopen or create a new PR once you're ready to continue. Thanks for your contribution!"
           claude_args: |
-            --max-turns 10
             --allowedTools "Bash,Read,Grep,Glob"