v0.9.1-beta.4

Delta since previous beta (v0.9.1-beta.3) — 2 new changesets.

Patch Changes

• Agent-write content-divergence warnings now carry the converged document inline so an agent recovers without a second read. structuredContent.contentDivergence gains currentState ({kind:"inline", content}, or {kind:"truncated", byteLength, hint} over a 50 KB soft cap) plus a coarse divergenceType. The Site A gate is extracted to a shared predicate and extended to version({ action: "rollback" }). Divergence is now rate-measurable via the ok.agent_write.gate_fired_total / ok.agent_write.content_divergence_total counters (bounded {handler} label). Adds a production-Electron agent-patch-divergence-probe smoke test as permanent regression coverage.