docs: add explicit Richard Gooding copyright line to NOTICE #66

Summary

NOTICE credits Richard Gooding in prose but doesn't reproduce his actual copyright line (Copyright 2023 Richard Gooding). The line IS in the syncmap.go file header. Apache 2.0 § 4(c) requires including copyright attributions from Derivative Works; while the upstream doesn't ship a NOTICE file, including the copyright line verbatim is cleaner legal hygiene.

Scope

Add Copyright 2023 Richard Gooding (or upstream's preferred attribution if different) as an explicit line in NOTICE, above the AxonOps block.

Acceptance criteria

1. grep 'Copyright 2023 Richard Gooding' NOTICE matches.
2. TestGovernance_NoticeFileExists asserts the new line.

Source: docs-writer.