Refresh ESKA README current state

[GerhardBalz-Admin]

Summary

Refresh the public ESKA README so it reflects the current governed publication and alignment state rather than the earlier namespace-migration / v0.1.0-next-step narrative.

Changes

• update ESKA core from module version 0.1.0 to the current 0.2.0;
• explain the governed SMO 0.1.0 SemanticModel alignment without transferring semantic ownership to ESKA;
• replace the in-progress namespace migration wording with the active W3ID state;
• identify eska-v0.2.0 as the current published repository release while retaining eska-v0.1.0 as historical immutable baseline;
• record the active/live-verified core 0.2.0 W3ID route;
• replace the obsolete create eska-v0.1.0 next roadmap item with the completed publication/alignment state;
• state the current backlog condition: no open ESKA issues.

Boundary

Documentation/current-state hygiene only. No ESKA ontology/module bytes, vocabulary, immutable release, W3ID route, publication contract, provenance evidence, or Pizza semantic source is modified.

Part of the public discovery-hygiene work tracked privately in SKE Private #12.