Adds a structured 1-3-1 decision-making framework as an optional skill.
Produces: one problem statement, three options with trade-offs, one
recommendation with definition of done and implementation plan.
Moved to optional-skills/ (niche communication framework, not broadly
needed by default). Improved description with clearer trigger conditions
and replaced implementation-specific example with a generic one.
Based on PR #1262 by Willardgmoore.
Co-authored-by: Willard Moore <willardgmoore@users.noreply.github.com>
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