v1.4.0 — skills layout, short descriptions, routers

v1.4.0 — 2026-09-06

Driven by Eric Provencher's "Rethinking skills and prompts for GPT-6 Astra" (2026-09-05) and the Claude Code skills docs, which cap each listed description at 1,536 characters and budget the whole listing.

• Layout: every command moved from commands/<name>.md to skills/<name>/SKILL.md. Install is now cp -r ntkit/skills/* ~/.claude/skills/. Delete old copies in ~/.claude/commands/ after upgrading.
• Descriptions: all 23 cut to 15 words or fewer, trigger first, side effect named (657 → 289 words in aggregate).
• Routers: autopilot, walkthrough, guide, forward-pass, capture, windup, harden are now a short SKILL.md (contract, guards, stop-lines, a phase table) plus references/ files read on entering each phase. Procedure text moved verbatim; nothing was dropped.
• AUTHORING.md: §1 description rule (15 words), new §9 "Route, don't recite", checklist updated.
• Fix: capture-nt tag-listing command used rg -ohI with a brace glob and printed ripgrep's help; replaced with a grep -rhoE form.
• .worktrees/ gitignored.
• /spar-nt remains as the deprecated alias for /harden-nt.