100x visual upgrade: consistent YAML frontmatter, hero block, schema docs, provenance, cross-links, citation — Doctrine v6

feat(tags): add discoverability tags [visibility-layer-2]

sync: mirror szl-holdings/vsp-otel@4fd1e93 (README fix)

sync: mirror szl-holdings/vsp-otel@ad2591e

feat(card): P3 polish — add hero, what-is-NOT, how-to-work (doctrine v6)

[doctrine-enforcer-L] 10/10 SZL Style Canon v6 — OG image, verification receipt, cross-link table, 11+ tags

mirror github.com/szl-holdings/vsp-otel@c2c922a20aa3

initial commit