Build WHEELY Overlay, a broadcaster toolkit for the Squeekchain live stream: a set of transparent browser-source widgets that an OBS or vMix operator drops straight onto the video feed, plus one integrity panel that independently checks the wheel telemetry. Nobody has built stream tooling yet; every existing Squeekchain site is a dashboard for viewers to open in a separate tab, so this must be designed for being composited over live video, not for being read on its own.

Data sources, all public, CORS-enabled, no API keys, polled every 5 seconds with the previous value kept on failure: GET https://api.squeekchain.com/v1/status gives measurement.coreStatus, measurement.rpmMilli, measurement.speedMmPerSecond, measurement.distanceMm, measurement.cumulativeWorkUnits, measurement.observedAt, measurement.staleAfterSeconds, measurement.counterEpoch, measurement.provenance, measurement.freshness, builder.anchor.blockHeight, builder.anchor.blockProgress (0 to 1e9), builder.anchor.workPerThousandBlocks, oracle.state, settlementQueue.state, signer.kind, signer.algorithm, signer.keySlot, signer.lastVerifiedAt, and modules[] with instanceId, moduleType, driverId and state. GET https://api.squeekchain.com/v1/core gives core.blockHeight, core.cumulativeWork, core.settledThroughRound, core.paused, configuration.roundDuration, configuration.genesisTimestamp and an events[] array of RoundRecorded and BatchSettled with blockNumber, transactionHash and blockTimestamp. GET https://api.squeekchain.com/v1/economy/state gives identities, supply and mining figures.

Deliver each widget as its own route under /overlay/, every one with a fully transparent background (html and body background transparent, no page chrome, no scrollbars) so it composites cleanly, sized for a 1920x1080 canvas but fluid, and configurable purely by URL query parameters so the operator never edits code: side=left|right, scale=0.5..2, theme=dark|light, accent=hex colour, hideWhenIdle=0|1. The widgets: (1) /overlay/ticker a slim lower-third strip showing RUNNING or ASLEEP, live rpm, rim speed in mm/s, block height and a block-progress bar driven by blockProgress/1e9, with a smooth count-up animation between polls instead of jumping; (2) /overlay/round a round timer derived from configuration.genesisTimestamp and roundDuration that counts down to the next round close and flashes when a RoundRecorded event for that round lands; (3) /overlay/alerts a toast strip that fires only on state transitions worth showing on camera: the hamster waking up or falling asleep, a new block completing, a BatchSettled landing, the oracle or settlement queue leaving the accepted or submitted state, and the measurement going stale past staleAfterSeconds; each toast auto-dismisses and never stacks more than three deep; (4) /overlay/integrity the integrity panel described below; (5) /overlay/commands a rotating cheatsheet of the stream game commands spin, use, merge, me and help, with the six hash families fire water earth air lightning star and the five tiers common uncommon rare epic legendary, so new viewers learn how to play without the host repeating it.

The integrity panel must do real work, not decoration. Keep a rolling in-browser log of each poll, then derive and display: wheel revolutions implied by the change in distanceMm against a rim circumference the operator sets with a circumferenceMm query parameter defaulting to 471; the work units added per implied revolution, so a constant ratio shows the counter and the chain agree; a plausibility verdict that flags any sample where cumulativeWorkUnits rises while rpmMilli is zero, where distanceMm rises faster than the reported rim speed allows for the elapsed time, where distanceMm or cumulativeWorkUnits ever decreases, or where counterEpoch changes (which means the hardware counter restarted and deltas across that boundary must be discarded rather than counted); a freshness clock showing the age of measurement.observedAt against staleAfterSeconds; and the attestation line naming signer.kind, signer.algorithm, signer.keySlot and the age of signer.lastVerifiedAt. State each verdict as OK, STALE or IMPLAUSIBLE with the exact numbers that produced it, never a bare colour.

Also ship a single /index.html control room for the operator: a live preview of every widget, the generated browser-source URL for each one with a copy button, width and height to paste into OBS, and a short setup note. Plain HTML, CSS and vanilla JavaScript, no build step, no dependencies, no analytics, no tracking, no fonts fetched from third parties. Must hold up at 1280x720 and 1920x1080 and still be readable on a 360px phone for the control room page. Never block the page on a failed fetch: show the last known value with an explicit stale age. Include a README covering every query parameter, the exact OBS browser-source settings, the endpoints used, and the integrity checks with the formula behind each one.