Resilience4j @Retry(maxAttempts=3) against a permanently-dead downstream: counting convention
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maxAttempts=3, downstream permanently down
downstream calls before giving up: 3
Resilience4j's maxAttempts is the TOTAL call count (initial attempt included): 3, not 4.
Core's @Retryable(maxRetries=3) is 3 retries AFTER the initial attempt: 4 total
(see docs/output/03b-retryable-no-memory.txt). Same-sounding config, different arithmetic --
porting a maxRetries value from one to the other by name alone is off by one.