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beb753ed72
installClaudeCode() pipes `curl -fsSL | bash -s --`. Bash exits with the status of the last command, so when curl fails (429 rate limit, 403, or connection error) `bash -s` still exits 0 on empty stdin and the action logs "Claude Code installed successfully". The 3-attempt retry loop never triggers because the first attempt looks successful, and the run later dies with "Executable not found in $PATH: claude". Prefix the pipeline with `set -o pipefail;` so curl's non-zero exit propagates through the pipe and the retry loop can actually kick in. Extracted into buildInstallCommand() with regression tests covering both the old buggy shape and the fixed one.