Trim 13 always-resident-unused claude.ai-sync skills (~1.8k tok/agent)

coder-venus-cc /context 2026-09-28: pptx/xlsx/docx/computer-use/browser/pdf etc (13 skills) sit resident in every session's 5.7k skill budget and are never invoked in this lane. Confirm whether skill enablement is per-agent-configurable (launcher/settings) or fleet-default; if configurable, scope to the skills each lane actually uses. Evidence in reference_mcp_http_transport_context_cost.md / project_token_reduction_plan_2026_09_28.md (monitor-context-cc memory).