Fuaran.UI.Telemetry.Abstractions 0.39.0

Op-stream replay engine — folds OpRecord sequences through the Fuaran.UI.Ops apply engine to reconstruct any tree state. Companion to Fuaran.UI.OpStream.Abstractions. Apache-2.0 licensed.

Fuaran incremental re-derivation engine — effect-aware memoisation over the Phase 180 artifact-function apply. Caches substituted fragment trees keyed by (function-identity, arg-set); a value-parameter change reuses the structural tree and recomputes only the affected hole-addressed bindings; effecting functions bypass the cache; op-stream replay resolves through the cache to a byte-identical tree. Apache-2.0 licensed.

Fuaran renderer – Fable + React + Feliz. Every string-to-DOM seam carries a declared sanitisation posture (SANITIZATION.md states it seam by seam): an allowlisted URL-scheme floor on href/src that also rejects the protocol-relative spellings, a positive character gate on extra-attribute names, and a raw-HTML floor over rendered markdown. Interactive dispatch fails closed – a shipped runtime denies until the host grants, and the permissive posture is reached by name. Apache-2.0 licensed.

Drift detector for Fuaran op-apply telemetry. Computes per-OpKind aggregate metrics (success rate, p50/p95 latency, top decoder-rejection reasons, top NodeNotFound NodeIds) and flags week-on-week success-rate regressions exceeding an operator-tunable threshold (default 10pp). Also ships a deterministic StyleFlag drift detector (Phase 151) — the resolved-style twin that diffs declared-invariant flag sets across two windows of StyleObservation to surface newly-introduced / cleared visual-legibility violations, severity-weighted by the ThemeManifest's invariant weights (semantic visual regression, no pixels, CI-gateable). Manual-run console tool for now (`dotnet run --project src/Fuaran.UI.Telemetry.Drift`); cron-friendly later when an operator-decided threshold is wired into a scheduled job. Companion to Fuaran.UI.Telemetry.Abstractions. Apache-2.0 licensed.

Default IFuaranTelemetrySink implementations for Fuaran op-apply + AuthorizingRuntime-deny telemetry. NoOpSink is the "I don't care" default at install; InMemorySink is a per-process ring buffer for tests + ad-hoc inspection; ConsoleSink writes to stdout for dev environments. Companion to Fuaran.UI.Telemetry.Abstractions. Also ships Apply.applyWithTelemetry — a thin wrapper around Fuaran.UI.Ops.Apply.apply that emits one OpApplyTelemetry record per op (the opt-in seam until the applyAndPersist integration lands and both sinks wire in at the apply-engine dispatch point). Apache-2.0 licensed.