Digital Employee v0.6.0

What's Changed

• docs(verification): pin ledger to the 0.5.0 release evidence by @PeterGuy326 in #204
• feat(contract): turn-envelope v1alpha2 optional conversationRef back-link (#205) by @PeterGuy326 in #206
• feat(engine): permission enforcement on org-permissions.v1 — pre-check, denial evidence, mode consumption, freshness (#159) by @PeterGuy326 in #211
• security(docs): remove non-synthetic public evidence by @PeterGuy326 in #208
• feat(engine): wire memory_recall slot to strict MemoryPort seam (#209) by @PeterGuy326 in #212
• feat(engine+core): strict read-only ContextPort and pinned workbench adapter (#179) by @PeterGuy326 in #213
• chore(release): prepare v0.6.0 (#217) by @PeterGuy326 in #218

Full Changelog: v0.5.0...v0.6.0