Agent Skills: proposal-writing

Produce the proposal + Statement of Work (SoW) that frames the paid Decision Phase (P1) offer — with an explicit in/out scope boundary, priced as a fixed frame. This is the ENTRY skill of the consulting front-of-funnel: it qualifies the need, frames the Decision Phase offer, prices it (delegating the numbers to `estimation`), and writes the proposal + SoW. It OWNS proposal/SoW production and the scope-boundary discipline; it DELEGATES pricing/effort to `estimation`, executive framing to `executive-communication`, and the P1 deliverable definition to `decision-package`. Triggers — "write a proposal", "draft the SoW / Statement of Work", "scope boundary for this engagement", "fixed-cost proposal", "frame the Decision Phase offer". Not for producing the Decision Package itself (that is `decision-package`), not for free P0 orientation (that is `semantic-consulting-coach`).