feat(voyage)!: add TRADEMARKS.md disclaiming Anthropic affiliation [skip-docs]

plugins/ultraplan-local/TRADEMARKS.md

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+# Trademarks
+
+## Third-party trademarks
+
+**Claude** and **Claude Code** are trademarks of Anthropic, PBC.
+**`/ultraplan`** and **`/ultrareview`** are named features of Anthropic's
+Claude Code product.
+
+Voyage is an independent open-source project. It is not affiliated with,
+endorsed by, or sponsored by Anthropic, PBC. The Voyage project receives no
+support, approval, or authorization from Anthropic for any aspect of this
+software.
+
+Voyage uses the names "Claude" and "Claude Code" solely to identify the
+platform within which Voyage operates. This is nominative use: the platform
+cannot be identified without its name, only as much of the name is used as is
+necessary, and no affiliation or endorsement is implied.
+
+Voyage does not use, integrate with, replicate, or compete with Anthropic's
+`/ultraplan` or `/ultrareview` features. The previous command names
+`/ultraplan-local` and `/ultrareview-local` were retired proactively to
+remove any potential confusion with Anthropic's own feature namespace.
+Voyage's commands are prefixed `/trek*` and are entirely independent of any
+Anthropic-named feature.
+
+## Voyage's own marks
+
+**Voyage** and the **`/trek*`** command prefix are names used by this
+project. They are not registered trademarks. Nothing in this file grants
+permission to use "Voyage" or "/trek*" in any way that suggests this project
+is the source of software it did not produce.
+
+## Trademarks of other parties
+
+Any other trademarks referenced in Voyage's documentation belong to their
+respective owners and are used for identification purposes only. Their use
+does not imply endorsement of Voyage by those owners, nor endorsement of
+those owners' products or services by the Voyage project.
+
+## Contact
+
+Trademark questions may be raised via the project's issue tracker.