ci(claude-review): raise --max-turns 20 -> 50

The Claude Code Review action runs /code-review:code-review with a hard
--max-turns cap. On large PRs (e.g. #3636 "add stm32c5 support", 29 files
/ +1689), the agent exhausts 20 turns exploring the diff before it can
produce and post its review, so the SDK returns an error and the
claude-review check fails red with:

  Reached maximum number of turns (20)

Raise the cap to 50 so port-sized PRs complete and post their review.
Cost scales with tokens, not the cap: a finished review pays the same
whether the ceiling is 25 or 50 — the cap only bites when the agent
would otherwise be force-stopped mid-run.

Co-Authored-By: Claude Opus 4.8 <[email protected]>

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