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Mike Ma 7723430ee3 Fix v3 gzip extra field to use a valid RFC 1952 subfield ... The chart v3 save path was writing raw marker bytes into the gzip `Extra` field, which produced malformed subfield metadata in readers that validate RFC 1952 framing. Wrap Helm's existing marker payload in a proper gzip subfield header (`SI1 SI2 LEN DATA`) and keep the payload unchanged. Reject oversized subfield payloads before encoding the two-byte gzip length. Add regression coverage for the extra field framing, oversized payload guard, and repeatable save hashes. Tested: go test ./internal/chart/v3/util -run TestSavedGzipExtraFieldIsValid -count=1 (Go 1.26 container) Tested: go test ./internal/chart/v3/util -run TestGzipExtraFieldWithSubfieldRejectsOversizedPayload -count=1 (Go 1.26 container) Tested: go test ./internal/chart/v3/util -run TestRepeatableSave -count=1 (Go 1.26 container) Tested: go test ./internal/chart/v3/util -run 'TestSavedGzipExtraFieldIsValid|TestGzipExtraFieldWithSubfieldRejectsOversizedPayload|TestSave|TestRepeatableSave' -count=1 (Go 1.26 container) Signed-off-by: Mike Ma <mike.ma@lmctl.com>		2 weeks ago
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v3	Fix v3 gzip extra field to use a valid RFC 1952 subfield	2 weeks ago