nx_vizsla_ics.nx

nx_vizsla_ics.nx -- NISHI VIZSLA R-CAL.4 (census PA14 interop): RFC 5545 iCalendar EXPORT. Operator 2026-07-07: "exposing a calendar for a group to coordinate" -- the sovereign calendar store becomes a standards-compliant .ics artifact ANY calendar app (Google/Apple/Outlook/ Thunderbird) can import or subscribe to. READ-ONLY over the R-CAL data plane (cal: events + rec: RRULE records written by nx_vizsla_calendar); the data never needs a cloud account. Command (argv[1]): export <prefix> <from YYYY-MM-DD> <to YYYY-MM-DD> <out.ics> cal: events with from<=date<=to -> VEVENT (DTSTART/DTEND local floating time) rec: rules intersecting [from,to] (first occurrence <= to AND last >= from) -> VEVENT anchored at sdate + native RRULE passthrough (FREQ=DAILY|WEEKLY|MONTHLY|YEARLY;INTERVAL;COUNT) RFC 5545 discipline (the gate's oracle): CRLF line ends; VERSION:2.0 + PRODID; every VEVENT carries UID (stable "<id>-<YYYYMMDD>@nishi.vizsla") + DTSTAMP; TEXT escaping of \ ; , in SUMMARY; content lines folded at 75 octets (continuation = CRLF + single space). DETERMINISM: no clocks -- DTSTAMP derives from the record's own date, so the same store exports byte-identical .ics every run (subscribable artifact, CID-friendly). HONEST SCOPE: floating local time (no VTIMEZONE) -- right for a same-timezone friend group; TZ-aware export is a later rung. Loud-fail: bad dates, to<from, unwritable out, unknown cmd. spec: knowledge/research/2026-06-22-vizsla-sclass-roadmap.md license_tier: ORIGINAL