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* refactor(s3api): move Lifecycle XML structs to leaf package lifecycle_xml The structs S3 PutBucketLifecycleConfiguration parses and the canonical conversion to s3lifecycle.Rule lived in package s3api, which transitively imports weed/server (which imports weed/shell). Any caller outside weed/s3api — the shell, the future lifecycle worker — that wanted to parse a bucket's lifecycle XML hit an import cycle. Moves: weed/s3api/s3api_policy.go -> lifecycle_xml/types.go weed/s3api/s3api_lifecycle_canonical.go -> lifecycle_xml/canonical.go s3api_lifecycle_canonical_test.go -> lifecycle_xml/canonical_test.go s3api_policy_test.go -> lifecycle_xml/round_trip_test.go Renames the public RuleStatus type (was unexported ruleStatus) and adds small accessor methods (Set/Val/AndSet/TagSet) for fields the s3api handler needs to read across the package boundary. Adds NewPrefix and NewExpirationDays constructors so the GET handler can build response rules without poking at unexported fields. Adds a Tag struct local to the package so it has zero internal seaweed deps. Adds a one-shot ParseCanonical(xml []byte) helper for non-server callers. s3api_policy.go was misnamed — its content is lifecycle XML, not S3 bucket policy. The new package name reflects the actual scope. * test(s3api/lifecycle_xml): exercise public API in tests - canonical_test.go's parseLifecycle helper went through xml.Unmarshal directly; route it through the package's exported Parse so tests validate the public entrypoint. - round_trip_test.go asserted internal flags (rule.Filter.tagSet, rule.Filter.andSet, Transition.set, NoncurrentVersionTransition.set); switch to TagSet(), AndSet(), Set() — exercises the public contract that downstream callers (s3api handler, future shell command) rely on.