Flue reaches a 1.0-line beta and makes durable, recoverable agent execution the default

What this changes for operators

• Flue shipped durable, recoverable agent execution with pluggable SQLite or Postgres persistence (0.10.0) and reached its first 1.0-line beta (1.0.0-beta.1), a migration-heavy stabilization (valibot tool schemas, opaque run_ IDs, run-introspection exports). It also swapped standard WebSocket and SSE for a proprietary Durable Streams transport (0.10.2), narrowing external observability. Category evidence that the model+harness split is maturing into stateful infrastructure; the experimental-API caution starts to lift.