[stefan-jansen]

Closes #107

Outcome

Honor CME Globex cryptocurrency futures/options' May29,2026 transition while preserving the historical backend schedule through that date. Friday launch maintenance ends16:30 Chicago time; ordinary weekdays reopen16:02 and Saturday maintenance is02:00-04:00. Following-business-day trade labels span weekends and holidays. Ordinary spot24/7 keeps civil dates and does not inherit CME maintenance. Other CME products and the upstream registry are unchanged.

Reuse shared FeedSpec selection and native tradable intervals. The local adapter combines the existing historical crypto schedule with CME_TradeDate business labels. Its holiday rules were inspected against CME's2026 reporting table; actual provider cases cover Juneteenth, observed Independence Day, Labor Day, Thanksgiving, Christmas and ordinary Columbus/Veterans Day controls. Session assignment/completion and intraday gap classification query through the next business date instead of relying on one/two-day padding. Preserve existing padding for other calendars.

Executed evidence

• Immutable main721adee9536d2f25870d696108ff1aede77b0262, actual SyntheticProvider/SessionAssigner/SessionCompleter workflows:33cases produce19failures and14passing controls, clean exit1 under ordinary fixtures. No acquisition/calendar mocks. Observed rows and their original prices/volumes/timestamps are checked for preservation.
• Focused initial repair d99c60f passed118tests and the full3983-test suite with86.27%coverage and ResourceWarning as error. That earlier source is not substituted for final integrated qualification.
• After merging prerequisite PR100/main74f4e483dfe3e57b259c65de751f6f2afa6e93b2, intermediate b097dae still fails two actual gap workflows: holiday Saturday needs Tuesday's label and launch Friday needs Monday's. Two maintenance/spot controls pass. The shared dynamic-coverage fix corrects both.
• Current b75d05f:215focused tests pass14.05s, including all37CME cases, existing native sessions, daily/intraday classification, real updater storage and custom interruption contracts. Full-source Ruff check/format100,ty,normal commit hooks and diff check pass. Current full supported/platform/resource/package/security/docs gates remain required and are being qualified.

Review and compatibility

Owner reviewed actual transition dates, Chicago DST conversion, business holidays versus trading closures, interval boundary sides, inserted versus retained observations, shared declaration precedence and downstream query coverage. AI-assisted implementation/tests/prose under maintainer direction; no independent reviewer claimed.

Canonical calendar selection is explicit argument > declared feed metadata > NYSE. ExplicitNone stays disabled. The CME compatibility exchange selector still maps to CME Globex Crypto, not every CME product or spot-quoted futures. See the updated existing sessions guide for authoritative CME links and scope.

Data0.2.1 remains immutable. General intraday acquisition planning(issue110), general schedule-aware filling(issue109), validation(issue108) and published-Specs consumer qualification are separate accepted work, not completion claims here. No release/deployment.

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