v0.15.1

Fixed

• First-run welcome banner now shows the noun-first grammar. The 0.15.0 refactor moved the canonical surface to noun-first verbs but left welcome.tsx's hardcoded command list on the pre-0.15 spelling (add plugin, bare mcp/skills, <from> <to>, rm <server>, plugin list). The banner now lists plugins add, mcp sync, skills update, mcp <from> <to>, mcp rm, and plugins list, matching syncthis help.