A telemetry batch may arrive out of order and contain repeated sequence numbers. Produce the missing ranges without expanding a large gap into one item per missing reading.
Build the implementation in Go under /app, with /app/run.sh as its entry point. Read one JSON request from standard input and write one JSON result to standard output. Input maps sensor names to nonnegative integer sequence numbers. Sort and deduplicate readings. Return only sensors with gaps, mapped to inclusive [start,end] intervals strictly between their minimum and maximum reading. Reject boolean, negative or noninteger readings. Return sensor keys sorted.
Reject inputs that violate an explicit validation rule with exit status 2, no standard output, and {"error":"invalid_input"} on standard error. For valid input, exit with status 0. Keep the implementation reusable for new inputs; it must work offline and must not depend on the example data being the only data it receives.
Repair or replace the unfinished /app/run.sh and add source files under /app. Malformed JSON must use the same invalid-input response. Do not read /tests or /oracle from the application.