chore(workspace): remove dead defensive block in load_skills AST gate

[HongmingWang-Rabbit]

Summary

Self-review of #2553 (#119 PR-4) caught an unreachable defensive block at test_load_skills_call_sites.py:99-103:

for call in _find_load_skills_calls(tree):
    if call.func.__class__.__name__ == "Name" and call.func.id == "load_skills":
        # Skip the function DEFINITION itself (it appears as a
        # FunctionDef, not a Call — but the Call check ensures
        # we only trip on actual invocations). Defensive.
        pass
    if not _has_current_runtime_kwarg(call):

The inner check guarded against FunctionDef, but _find_load_skills_calls already restricts its return type to ast.Call — a FunctionDef cannot reach that loop body. The block is a no-op pass with a misleading comment that implies the check matters for correctness when it doesn't.

Removing keeps the gate behaviorally identical; both tests still pass (pytest workspace/tests/test_load_skills_call_sites.py → 2 passed).

The five-axis review that turned this up also approved the substantive logic of #2553 — this is the only follow-up cleanup it surfaced.

Test plan

• pytest workspace/tests/test_load_skills_call_sites.py → 2 passed
• Diff is -5 lines, no behavior change

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