Pre-#1615 Windsurf installs wrote skills under .devin/skills/gsd-*/ (Devin Desktop preferred dir, #1085). PR #1615 moved Windsurf to .windsurf/workflows/ but never cleaned up the old layout. Users upgrading from a pre-#1615 install were left with dead .devin/skills/gsd-* directories that nothing reads anymore.
Fix: added cleanupWindsurfLegacyDevinSkills() which mirrors the Codex cleanupCodexSkillMetadataSidecars() pattern. Runs on Windsurf local install, removes GSD-managed .devin/skills/gsd-* dirs, preserves user content (non-gsd- dirs, gsd-dev-preferences per #2973, symlinks). Empty .devin/ and .devin/skills/ containers are pruned; non-empty ones are left intact.
5 regression tests: removes gsd-* dirs; preserves user content; skips symlinks (escape guard); no-op when absent; end-to-end install removes pre-staged legacy artifacts.
Refs #1629 (Finding B; Finding A addressed in #1630).
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