Phase 4b openclaw side. Provides fade primitives matching Plexum-sdk-
go/fade so renderFaded / tick are API-parity available, but stops
short of activating fade in the live before_prompt_build hook since
openclaw plugin SDK ctx doesn't currently expose currentTurn to
plugins. Plexum side fully wires fade per turn.
plugin/tools/fade.ts (new): TS port of the fade algorithm. Maskable
rune set matches Plexum source. PRNG is Mulberry32 instead of Go's
math/rand — documented in the file: cross-runtime mask patterns
DIFFER, but each runtime fades its own session-local kb-block
independently so no comparison is expected.
plugin/tools/kbblock.ts: Entry gains seed (random u31 at add());
render() unchanged behaviour, plus new renderFaded(currentTurn,
params) + tick(currentTurn, params) for future wiring when
openclaw exposes turn signal to plugin hooks.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
