docs(yield): release note — multi-language SDKs + converter

labs/22-yield/distribution/release-notes/2026-08-01-multi-language-and-converter.md

@@ -0,0 +1,20 @@
+### Four languages, one certified contract — and a converter
+
+Yield is now multi-language. The canonical `ir/yield.v1` schemas define
+everything that crosses a process boundary, and four SDKs implement the
+same Locus-certified execution contract: Go (`sdk/yield`), TypeScript
+(`sdk/typescript`, Node ≥ 23.6), Python (`sdk/python`, import
+`yieldskill`), and Rust (`sdk/rust`, crate `yieldskill`). Non-Go skills
+declare their runner in `skill.json`.
+
+The conformance suite (`internal/conformance`) runs the same program in
+all four languages through the real supervisor and asserts identical
+observable protocol behavior — including loud divergence on a tampered
+journal in every SDK.
+
+New examples: `release-checklist` (TypeScript, human-gated deploy),
+`env-doctor` (Python, probe/branch/resume-after-human), `data-migration`
+(Rust, dry-run → approve → apply → verify), and `convert-skill` — a
+converter, itself a Yield skill, that turns an existing prose `SKILL.md`
+into a Yield program in the language you pick and completes only when
+the generated skill passes its own fixture run.