PR #1622 (issue #1615) shipped Windsurf /gsd-* workflow wrappers that delegate to command bodies at <targetDir>/.windsurf/gsd-core/commands/gsd/X.md via a hardcoded @~/.claude/gsd-core/commands/gsd/ path. The path-rewrite pipeline correctly substitutes ~/.claude/ to the install target. But the source gsd-core/ dir does not ship with commands/ — the canonical command source lives at the package root (commands/gsd/). Without this copy, every /gsd-* workflow in Cascade references a file that does not exist. The slash commands appear in the / menu but silently fail when invoked because the LLM is told to read a missing file.
None of the original reviews caught this: not the security review, not Codex's adversarial orthogonal review (gpt-5.5/high), not Memtrace's graph-backed review. It was surfaced by a #1629 regression test that verifies 'every workflow @-reference target exists on disk after install' — the test failed, revealing the bug.
Fix: for Windsurf local installs, copy commands/gsd/*.md into <targetDir>/gsd-core/commands/gsd/ via copyWithPathReplacement (applies the same path+brand rewrites as the rest of the install). Guarded on isWindsurf && !isGlobal since global Windsurf workflow install is an explicit no-op.
Documented as DEFECT.WORKFLOW-DELEGATION-TARGET-NOT-INSTALLED in CONTEXT.md so the pattern is locked in: any new converter emitting a wrapper that delegates to another file MUST verify the delegation target is actually installed.
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