Auto-generate SKILL.md from CLI command catalog

[gmoon]

Requirement

REQ-CLI-020 — Auto-generate SKILL.md from CLI command catalog

Summary

lattice init --skill currently ships a static, hand-maintained SKILL.md template. When new commands or flags are added (like --files and --test-command on edit), the skill can go stale, causing agents to miss capabilities and fall back to editing YAML directly.

Instead, init --skill should generate the skill from lattice --json (the command catalog), ensuring it always reflects the current CLI surface.

Motivation

Inspired by gws (Google Workspace CLI) which auto-generates 92+ agent skills from its Discovery Document metadata via gws generate-skills. See SRC-GWS-CLI in the lattice.

Acceptance Criteria

• lattice init --skill generates SKILL.md from the --json command catalog
• All commands, parameters, and examples from the catalog appear in the generated skill
• Hand-written workflow sections (Before/During/After work) are preserved via a template or merge strategy
• RFC 2119 editing rules and cli-gap feedback loop are included in generated output
• Generated skill is functionally equivalent to or better than the current hand-maintained version

Lattice

• Derives from: THX-SKILL-AWARE-GRAPH
• Source: SRC-GWS-CLI