v0.6.3 -- Style system + critique restructure

Structured Style Presets

Style .yml presets now carry 4 new blocks beyond tokens: intensity (variance/motion/density dials 1-10), patterns (component composition rules for card, button, input, badge, nav, layout), constraints (never/always guardrails), and effects (interaction vocabulary). All 34 presets updated.

A new STYLE.md template renders these into a single agent-readable contract. A token-mapping.md reference maps .yml tokens to shadcn, Tailwind, vanilla CSS, and NativeWind theming APIs. Six new audit tests (T8-T13) validate the schema.

Domain Skills + Creative Director

The identity phase splits creative decisions from technical execution. gsp-identity-designer becomes gsp-brand-creative-director -- it picks colors, typefaces, and imagery direction. Eight new composable domain skills add technical precision after: /gsp-color (OKLCH palettes, WCAG contrast), /gsp-typography (mathematical scales, font loading), /gsp-logo, /gsp-images, /gsp-icons, /gsp-textures, /gsp-video, /gsp-3d.

Each skill works standalone or as a pipeline building block. They load references on-demand via Read, not in execution_context.

Guidelines Pipeline Rewrite

gsp-brand-patterns becomes gsp-brand-guidelines with a two-pass architecture. Pass 1 produces .yml + STYLE.md + guidelines.html. The user reviews in the browser. Pass 2 (after approval) produces token-mapping.md + component overrides. gsp-pattern-architect becomes gsp-brand-engineer.

Critique Restructure

Research across NN/g, Google, Figma, and Designlab frameworks revealed the evaluation order matters. The critic now flows: strategy (is this solving the right problem?) -> brand contract (STYLE.md compliance) -> usability (Nielsen-scored X/50 with inline 1-5 anchors) -> accessibility -> content quality -> implementation quality (anti-patterns) -> taste signals -> synthesis.

HIG, Nielsen heuristics, and anti-patterns are distilled into agent prompts (~30-40 lines each) instead of inlining full reference files (~1,400 lines saved per pipeline run). Anti-patterns yield to STYLE.md precedence -- if a preset explicitly defines a technique, it's an intentional brand choice, not a violation.

Prompt Consolidation

All 12 numbered prompt stubs (gsp/prompts/01-12) deleted. They were vestigial -- methodology had migrated into agent definitions. Removed from 10 skills' execution_context, installer bundle dirs, audit tests, and documentation. The installer now cleans up legacy prompts/ directories during install.

Naming Cleanup

/gsp: (colon) -> /gsp- (hyphen) across all 29 source files. Source now matches Claude Code's registration syntax natively. Installer simplified -- removed prefix-adding logic. Integration tests rewritten (34 tests covering namespace contract across all 4 runtimes).