fix(m6-synthesis): comprehensive [SUPERSEDED] sweep across SKILL-AUDIT.md and ADVERSARIAL-SYNTHESIS.md

Inline-mark every stale ELEVATE/lift/significance/TRIGGER-ONLY/ELEVATE-leaning
claim and embedded numeric lift parenthetical across both historical docs.
Add file-level [SUPERSEDED] banner to ADVERSARIAL-SYNTHESIS.md. Canonical
scorecard (ZERO robust-ELEVATE; systems/red-team/five-whys-plus=NO-LIFT;
scientific-method=DIRECTIONAL-NOT-REPLICATED) cited inline where applicable.
Gate grep now returns zero stale current-looking verdicts across the ENTIRE
tracked analysis surface.