Lands the end-to-end CoreSync demo (frost-influx-grafana.flow.json) along
with the supporting normalizer/identity/interpolation/reducer work, plus
a targeted fix for the under-compression bug surfaced by the FROST demo.
Under-compression fix (PointReducer):
- New burstWindowMs option (default 0, opt-in). When two samples arrive
within burstWindowMs of each other, the second is treated as the same
wall-clock observation: previous is replaced, slope analysis is skipped.
- Without this guard, sub-millisecond bursts (rotatingMachine emits twice
per pressure-injection cycle, ~1 ms apart) produced near-vertical
apparent slopes that tripped angle-change on every tick — driving
cog/efficiency/SEC streams to ~0.6% reduction (i.e. no compression).
- With burstWindowMs: 10 in the demo flow, the same streams now compress
at 78-93% (verified end-to-end in InfluxDB over a 3-min window).
- Editor HTML exposes the new "Burst dt" field with explanatory tooltip.
Regression test (test/basic/coresync.basic.test.js):
- New "burstWindowMs collapses sub-tick sample bursts into a single
observation" test reproduces the exact burst pattern from the demo
and asserts before/after behaviour.
- Existing 14 tests continue to pass.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
