Sequence logging effects in S3Writer using flatTap and *>

[Copilot]

Logging statements in S3Writer were executed for side-effects but their F[Unit] results were discarded, preventing the logs from actually being emitted.

Changes

• createS3Client: Use flatTap to sequence the logging effect after client construction
• ensureBucket: Refactor to use *> for proper effect sequencing across conditional branches

Example

Before:

Async[F].delay {
  val client = builder.build()
  log.info("S3 client created")  // Effect discarded
  client
}

After:

Async[F].delay {
  builder.build()
}.flatTap(client =>
  log.info(s"S3 client created for endpoint: ${config.endpoint}")
)

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