Replace match->context-params and mirrored-href with an in-place sync of the file-id, team-id and project-id keys on the parsed href: present ids are set, absent ones removed, every other param untouched. The backend keeps applying its own file, project and team priority.
Rewrite router tests around a href-only stub: mirror, skip, stale-strip, clear, unrelated-param preservation, every-present-id, repeated-key and subpath cases. Update the link-preview subsystem doc.
AI-assisted-by: muse-spark-1.3-contributor
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