v0.7.0 -- Two-layer architecture + skill consolidation

Two-Layer Skill Architecture

Skills are now explicitly split into two layers. Expertise skills (gsp-color, gsp-typography, gsp-visuals, gsp-accessibility, gsp-style) own domain knowledge as sibling files in domains/ and references/ directories. Pipeline skills own workflow -- state management, phase gates, agent spawning, user interaction.

Expertise skills serve the entire pipeline, not just one phase. Pipeline skills consume domain knowledge via two patterns: Read (passive, load sibling files) and Invoke (active, call the expertise skill with --enrich or --validate). Domain knowledge is never duplicated in pipeline skills.

Skill Consolidation

10 skills consolidated into 5 expertise skills with domains/ substructure:

• gsp-palette absorbed by gsp-color (palette generation becomes domains/palette.md, full system design becomes domains/system.md)
• gsp-typescale absorbed by gsp-typography (scale generation, font pairing, and full system design split across three domain files)
• gsp-images, gsp-3d, gsp-video, gsp-textures absorbed by gsp-visuals (each becomes a domain file, the skill routes by --imagery, --3d, --video, --textures flags)

Skills are now lean routers -- SKILL.md handles mode/flag parsing, context resolution, and delegation. Domain files contain the actual knowledge.

Reference Colocation

All 21 files from gsp/references/ moved into the skill directory of their primary consumer. Single-owner references go directly into the skill. Shared references (2-4 consumers) live in the primary consumer's directory; others read via cross-skill paths. Ubiquitous references (chunk-format.md) are duplicated into each consuming skill.

This eliminates the references/ runtime directory entirely. Sibling files in skill directories cost zero at session start -- they're inert until the skill runs and reads them.

Phase Transition Skill

The 12 identical copies of phase-transitions.md (1,584 lines total) are replaced by a single gsp-phase-transition utility skill. Pipeline skills invoke it with phase name and output directory; it reads STATE.md, renders the pipeline progress line and file tree, then returns control to the calling skill for routing.

Dev Skill Prefix

Dev skills renamed from gsp-* to gspdev-* so the installer's cleanStaleGspDirs function doesn't wipe them during upgrades. node bin/install.js --claude --local now auto-symlinks dev skills alongside GSP skills.