chore(docs): purge transient plan/spec artifacts missed by post-merge cleanup
- docs/plans + docs/specs (deploy-skill 2026-06-27): predate the BDR-065
lifecycle codification, never swept
- docs/superpowers/{plans,specs} (model-routing 2026-07-15): 6-wave
chantier — final W6 merge closed it without the purge step
Git history at the feature commits is the archive (BDR-065).
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