ePubLift/epublift cli-v1.13.0 on GitHub

Upgraded the validator engine (epubveri 0.1 → 0.4.4). Validation is now
materially more accurate — several common false positives are gone, so books
that wrongly failed before now pass:
- Legacy OPF2-style <meta name="cover" content="…"/> no longer flagged
  RSC-005 ("property must not be empty").
- Full-timestamp dc:date values (e.g. 2025-04-24T17:00:00Z) no longer
  flagged OPF-054 — a valid W3C-DTF timestamp is accepted.
- @media / @supports / @container stylesheets no longer flooded with
  spurious CSS-008 "syntax error" (common in Vellum-produced books).
- OPF-096 non-linear reachability now matches epubcheck's self-link rule
  (a nav that links to itself passes; a genuinely unreachable one is flagged).

check now reports the exact source position. When the engine can pin
one, a finding's location reads like a compiler diagnostic —
file:line:column (e.g. content.opf:103:5) — making problems directly
actionable. Checks with no single line to point at still show just the file.

Full Changelog: cli-v1.12.0...cli-v1.13.0