v4.13.0

Added

• Emit channel — third observer stream. scope.$emit(name, payload) + EmitRecorder.onEmit(event) alongside existing Recorder (data-flow) and FlowRecorder (control-flow). Pass-through semantics (see ADR-001): synchronous, in-call-order, zero-allocation when no recorder attached. Events auto-enriched with stageName, runtimeStageId, subflowPath, pipelineId, timestamp. Error-isolated dispatch — a throwing onEmit routes to other recorders' onError without stopping the loop.
• CombinedRecorder — unified observer covering all three channels (Partial<Recorder> & Partial<FlowRecorder> & Partial<EmitRecorder>). One object, one attachCombinedRecorder() call; the library routes to channels via runtime method-shape detection. Detection counts only OWN methods (prototype walkers ignored, preventing Object.prototype pollution).
• FlowChartExecutor.attachEmitRecorder() / detachEmitRecorder() / getEmitRecorders() — attach/detach convenience mirroring the existing recorder APIs. Emit recorders share the scope-recorder channel internally.
• NarrativeFormatter.renderEmit(ctx) hook — consumers customize how emit events render in the combined narrative. Returns string to use, null to skip, undefined to fall back to [emit] name: payloadSummary default.
• RedactionPolicy.emitPatterns: RegExp[] — matched event names have their payload replaced with '[REDACTED]' before dispatch (scrubbed at origin, never reaches recorders).
• Legacy primitives now dispatch on the emit channel in addition to their existing snapshot side-bags: $debug → log.debug.${key}, $error → log.error.${key}, $metric → metric.${name}, $eval → eval.${name}, $log.messages → log.debug.messages. Closes the long-standing gap where $metric/$debug calls landed in collectors no recorder observed. Backward-compatible — side-bags still populate for snapshot-based consumers.
• $break(reason?) with optional reason string surfaced on FlowBreakEvent.reason.
• SubflowMountOptions.propagateBreak: true — opt-in propagation of $break from inner subflow to parent. Default (false) preserves current behavior: inner $break stops only the subflow. outputMapper still runs before propagation; nested chains propagate through every hop that opted in; parallel/fan-out: breaks only when all fork children broke.
• ADR-001 documenting pass-through choice for emit channel — seven-perspective review rationale preserved at docs/internals/adr-001-emit-channel-pass-through.md.
• Examples: examples/runtime-features/emit/01-custom-events.ts (emit basics + regression guard), examples/runtime-features/break/04-subflow-propagate.ts, examples/runtime-features/combined-recorder/05-custom-renderer-subflow-inputs.ts.

Fixed

• CombinedNarrativeRecorder subflow-input ordering. Subflow-input lines now route through renderer.renderOp at flush time (same as other reads/writes), preserving narrative order and respecting custom renderers. Previously bypassed the formatter, appearing out of order with custom renderings.