The extracted normalize_skill_lookup_name() resolved trusted roots via
agent.skill_utils.get_skills_dir(), but skill_view() enforces
tools.skills_tool.SKILLS_DIR — a separate module attribute that callers
and 60+ existing tests patch directly. With the helper reading a
different symbol than the enforcer, any SKILLS_DIR patch (or future
divergence between the two resolvers) makes normalization disagree with
enforcement and absolute-path loads regress silently. Read SKILLS_DIR at
call time (deferred import, cycle-safe) with get_skills_dir() as the
fallback, and align the new tests to patch the enforced symbol.
Follow-up to the salvage of #59829 by @HexLab98.
713e50e7d2