v0.10.0

Adopted sigil: ^0.14 (sigil-stdlib auto-derived). Rewired N monorepo library deps to canonical extracted URLs at ^0.14.0 (sigil-http, sigil-crypto, sigil-sxml).

Unblocked by sigil-lang v0.14.4 which fixed two sigil-stdlib timezone regressions: IANA names like "America/New_York" are now honored by list->time-in-tz instead of silently falling back to UTC, and time-utc-offset-at returns the offset in effect on the given date (DST-aware) instead of the current moment's offset.

All 5 previously-failing ical-datetime tests pass against the new stdlib.