AccessControl v3.1.0

Added

• Temporal schedules — the during condition operator. Grants (and require() gates) can now be constrained to real schedules — recurrences, calendar ranges, unions of windows — via dtrexp expressions: .where('$.now during "T0900:1800 E1:5"') means weekdays, 09:00–18:00. Joins before / after / between in the Time operator family; works in string sugar, canonical JSON, combinators, gates, and on both the sync and async check paths.
• .during(expression) chainer on grants — fluent shorthand that ANDs a ['$.now', 'during', …] leaf into the grant's condition at commit; composes with .where() regardless of call order, and repeated calls AND together.
• Any date-like left side. Beyond $.now, the checked instant can come from context data ('$.booking.start during "…"') as a Date, epoch milliseconds, ISO string, or { epochMilliseconds } object. A non-date-like value evaluates false (fail-closed), never throws at check time.
• $.now.epochMilliseconds — the raw instant, now part of the derived $.now.* fields.
• The out_of_schedule deny reason + public permission.reason. When a check fails only because of a during schedule — it would be granted at a covered instant — the reason is 'out_of_schedule' instead of the generic 'condition_failed' / 'require_failed', so a UI can say "outside your access hours" and mean it ("granted, but not now"). If a value predicate also failed, the generic reason stands. The denial reason (previously event-only) is now also exposed as a public reason getter on Permission.
• Error codes INVALID_DTREXP and DTREXP_NEVER_MATCHES. Expressions are validated at every grants entry point (chainer commit, constructor, setGrants, grants-list, require(), restore()): malformed ones throw with dtrexp's message and character position; parseable-but-never-matching ones (D30 M2) are rejected as authoring bugs.

Security

• The during surface is bounded like the rest of the condition DSL: expression length cap (1000 chars), commit-time validation, and a bounded FIFO parse cache — untrusted serialized grants can't reach the check path unvalidated or grow memory through distinct expression strings.
• Timezone comes from the reserved context.tz (IANA name), the same key $.now.* uses; with no tz, both evaluate in the system zone — one timezone story across the condition system.

Changed

• AccessReason is now DenyReason. The type only ever describes a denial (undefined when granted), so it's named for what it is. AccessReason remains exported as a deprecated alias — existing imports keep compiling — and will be removed in v4.

Dependencies

• Added dtrexp 1.0.1 (exactly pinned, same author, zero transitive dependencies). Engines unchanged (Node ≥ 20).

Tooling

• CI now enforces the full quality bar. The workflow runs typecheck → lint → build → cover across the Node 20/22/24 matrix and a dedicated mutation job (Stryker, on Node 24) — so 100% coverage and the mutation threshold are gated on every push and PR, not just build + test.
• CI pins TZ=Europe/Istanbul so system-timezone default paths stay distinguishable from UTC in tests and mutation runs.