docs: hierarchical design-register library (lift gunbc.site L1/L2)

[gunbai-bot]

Summary

• Adds docs/plans/design-register-library.md — DOC-ONLY spec for lifting the reusable layers of the PR plan: gunb.ai site subsumption — dag-emitted frontend, Pages hosting, Deco-Gothic redesign #6927 gunbc.site stack into a site-independent gunbc.design.* library (L0–L5 layer model, override semantics, second-consumer discipline).
• Adds inbound link from DESIGN.md open threads (orphan-doc wall).

Key design points

• L0 cited perceptual law (WCAG/OKLCH contrast, CVD, vestibular safety) — dissolves the HSL lightness-gap proxy in theme_contrast_ok
• L1 house register walls (quiet envelope, still-until-touched, area-class chroma, behavioral intricacy)
• L2 register machinery — lift from tokens.dag / interaction.dag / theme_transition.dag without rewrite
• L3 per-brand identity (Morgan–Keenan accent binding stays gunb.ai instance)
• L4 surface archetypes (MarketingSite / DocsSite / Dashboard / ArtifactReport) + Phase C DataVizArea
• L5 site instance = register × identity × archetype × content
• Phase A fires on plan: gunb.ai site subsumption — dag-emitted frontend, Pages hosting, Deco-Gothic redesign #6927 merge; bar = emission-identical witness

Test plan

• DOC-ONLY — no dag/gunbc/site/ changes
• Inbound md-link from DESIGN.md
• Operator review of layer boundaries and gunbc.design.* module home

Made with Cursor

[gunbai-bot]

Review 40554 / 40555 (cursor + claude): Verified — both are APPROVE-only on the doc-only diff; no code, .dag, or Rust findings to action.

CI fix: The doc_graph_has_no_dangling_links failure was valid — outbound links to gunb-ai-site-subsumption-design.md dangled because that file only exists in PR #6927, not on main. Replaced with PR #6927 URLs until the sibling doc merges; dissolution note in the status block says when to upgrade the link.

— sent from stern-stag-172

[gunbai-bot]

Review 40587 (claude/claude-opus-4-7): Verified against 8e228ac — finding is accurate and already addressed.

• Doc-only diff: docs/plans/design-register-library.md (new plan), one open-thread li() in dag/gunbc/design_document.dag, and the matching emitted line in DESIGN.md (byte-identical to the dag authority).
• No dag/gunbc/site/ edits; no unit-modeling / code risk.
• Prior CI failure (generated_artifact_drift_gate_passes on 18b6dfe) was fixed by mirroring the hand-edited open thread into design_document.dag in 8e228ac; CI re-run 29801153711 is in progress on that SHA.

No further changes from this review.

— sent from stern-stag-172

[gunbai-bot]

Review 40588 (cursor/composer-2.5): Verified against 8e228ac — finding is accurate; no changes required.

• Doc-only diff: docs/plans/design-register-library.md + mirrored open-thread in design_document.dag / DESIGN.md; zero dag/gunbc/site/ edits.
• Plan content matches the review: lift-not-fork (L1/L2 extraction, gunb.ai as consumer Add SVG viz, test helpers, and makegen scaffold #1), L4 second-consumer gating (Phase B / second_site_scheduled), fail-closed propagation (§5 / coherence witnesses), named dissolution triggers throughout §10 and status block.
• No code, shell, or .dag unit-modeling changes in this PR.

— sent from stern-stag-172