docs: measurement trial-ready — digital mode + dispatcher fix + 71 tests

Bumps:
- nodes/generalFunctions  75d16c6 -> e50be2e  (permissive unit check + measurement schema additions)
- nodes/measurement       f7c3dc2 -> 495b4cf  (digital mode + dispatcher fix + 59 new tests + rewritten README + UI)

Wiki:
- wiki/manuals/nodes/measurement.md — new user manual covering analog and
  digital modes, topic reference, smoothing/outlier methods, unit policy,
  and the pre-fix dispatcher bug advisory.
- wiki/sessions/2026-04-13-measurement-digital-mode.md — session note with
  findings, fix scope, test additions, and dual-mode E2E results.
- wiki/index.md — links both pages and adds the missing 2026-04-13
  rotatingMachine session entry that was omitted from the earlier commit.

Status: measurement is now trial-ready in both analog and digital modes.
71/71 unit tests green (was 12), dual-mode E2E on live Dockerized
Node-RED verifies analog regression and a three-channel MQTT-style
payload (temperature/humidity/pressure) dispatching independently with
per-channel smoothing.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

wiki/index.md

@@ -38,6 +38,7 @@ updated: 2026-04-13
 
 ## Manuals
 - [rotatingMachine User Manual](manuals/nodes/rotatingMachine.md) — inputs, outputs, state machine, examples
+- [measurement User Manual](manuals/nodes/measurement.md) — analog + digital modes, smoothing, outlier filtering
 - [FlowFuse Dashboard Layout](manuals/node-red/flowfuse-dashboard-layout-manual.md)
 - [FlowFuse Widget Catalog](manuals/node-red/flowfuse-widgets-catalog.md)
 - [Node-RED Function Patterns](manuals/node-red/function-node-patterns.md)
@@ -46,6 +47,8 @@ updated: 2026-04-13
 
 ## Sessions
 - [2026-04-07: Production Hardening](sessions/2026-04-07-production-hardening.md) — rotatingMachine + machineGroupControl
+- [2026-04-13: rotatingMachine Trial-Ready](sessions/2026-04-13-rotatingMachine-trial-ready.md) — FSM interruptibility, config schema sync, UX polish, dual-curve tests
+- [2026-04-13: measurement Digital Mode](sessions/2026-04-13-measurement-digital-mode.md) — silent dispatcher bug fix, 59 new tests, MQTT-style multi-channel input mode
 
 ## Other Documentation (outside wiki)
 - `CLAUDE.md` — Claude Code project guide (root)