The newest published panel date, as a cheap conditional GET

Answers "has a new ASIC report landed?" in one small request. The alternative was polling `GetAvailableDates` and diffing. That is the wrong shape for the question: the data updates about once a business day at an hour you cannot predict, and the anonymous quota is 500 requests a month — so hourly polling spends more than the entire free quota to detect roughly 22 events, almost all of it on "nothing has changed". Send back the `ETag` as `If-None-Match` and an unchanged answer costs a `304` with no body. The ETag is derived from the content, so it changes exactly when the answer changes and never merely because time passed. `available_from` is the date the newest observation actually became public — ASIC publishes T+4 — which is usually what a daily engine is really waiting for. ```bash curl -A 'my-app/1.0' -H 'If-None-Match: "<previous etag>"' \ https://api.shorted.com.au/v1/latest ```

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