v0.166.0

Feat

• calendar: write the parameters the tools only pretended to accept

Fix

• calendar: stop the shorthand warning firing on ordinary offset changes
• calendar: name the read-side end date consistently, widen shorthand loss detection
• calendar: keep DESCRIPTION off AUDIO alarms and reject negative offsets
• calendar: warn on the last silent recurrence conflict, reject triggerless reminders cleanly
• calendar: drop VALARMs with no usable TRIGGER instead of failing the listing
• calendar: normalise foreign VALARM data instead of failing the listing
• calendar: build the inclusive UNTIL in DTSTART's zone, not UTC
• calendar: stop the reminder shorthand erasing what the caller omitted
• calendar: stop pinning recurring=False on every create call
• calendar: compute UNTIL from the DTSTART being written, not the stored one

Refactor

• calendar: name the fallback VALARM descriptions
• calendar: split the UNTIL and VALARM readers to clear S3776