Estate continuation (post-branding): Canva hero, README consolidation, wiki + business case

[hyperpolymath]

Tracks remaining estate cleanup/docs/branding for gossamer after the merged brand pass (#91). Feeds the paint-type Project #41 scheduler (DEP-04, the desktop shell).

Remaining (safe / additive)

• Canva hero (thread-silver) → brand/hero/social-profile.png + README (pattern: ephapax #326).
• Consolidate the 3 READMEs — README.adoc, README.md, README.adoc.invariants.md currently coexist; declare one canonical + clarify the others' role (do NOT blind-delete).
• 4-audience wiki: docs/wikis/{Home,Developer,Maintainer,User,Lay-Public,Glossary}.md + README.adoc index; add just wiki-sync.
• Business case: docs/business/{strategy-operations,supply-chain,marketing,finance,governance-legal-risk}/, seeded from .machine_readable/6a2/ECOSYSTEM.a2ml.

GATED — draft PR only

• CLADE uuid de-collision (a5ea1382… shared with paint-type/typed-wasm/paint-queue) — fresh uuid + gv-clade-index, keep canonical-name=gossamer.

Already tracked (not duplicated)

• Cleave-surface audit: ABI/FFI/Ephapax/Groove drift + ranked-ownership cleave (forward plan) #82 cleave-surface / ABI drift (Idris2-ABI vs Zig-FFI surface) — the load-bearing audit item for DEP-04.

Guardrails

Real runs only; no auto licence edits; no gate bypass; sign commits; draft PRs for gated.