v0.3.0

• Added: Testing\FakeTimeSource and Testing\SteppingTimeSource (#8).
• Added: Sleeper, UsleepSleeper and Context::sleep(); background()
  takes an optional Sleeper (#9).
• Added: Context::withoutCancel() (#10).
• Added: Context::withReserve() (#11).
• Added: Context::iterate() (#12).
• Added: ContextController::requestCancel() — deferred cancellation safe
  from signal handlers; listener failures surface from the next check (#13).
• Added: Context::joinedWith() — the internal state is now a DAG; a
  terminated node detaches from both parents (#14).
• Added: WireCodec and WireValue (#15). A missing or malformed incoming
  budget falls back to maxBudgetMs; bad input never lifts the limit.
• Fixed: withTimeout() truncated the duration to whole nanoseconds, so
  withTimeout(1.015) reported remainingMs() === 1014.0 right away.
• Docs: "Writing an adapter" — read the budget before assertActive().
• Docs: the agent skill (resources/skills/rasuvaeff-context/SKILL.md) is
  rewritten for 0.3 — safety rules, decision table; it no longer mentions a
  scheduler that does not exist.

v0.2.0

• Context::onTerminate() returns an unsubscribe closure
  (\Closure(): void) instead of void; calling it removes the listener,
  and it is a no-op once the listener ran. Source-compatible: callers that
  ignore the return value are unaffected (#1).
• A terminated context state detaches from its parent and releases its
  listeners and children, so a long-lived parent no longer accumulates every
  cancelled or expired child it derived. withValue() now shares its
  parent's state instead of attaching a new child per call (#1).
• withTimeout() no longer overflows: a timeout beyond the representable
  range saturates at a PHP_INT_MAX deadline, and a zero or negative timeout
  yields an immediate deadline (the context is expired on first
  observation) (#2).
• ContextExpiredException accepts an optional $previous throwable, so a
  transport adapter can keep the underlying timeout as the cause.
• Documented propagating a budget across a process boundary: send
  remainingMs(), rebuild with withTimeout($ms / 1000) on the receiving
  side (#4).
• README/llms.txt placeholders replaced with the real API reference, Russian
  README added, property tests for subtree cancellation and nearest-ancestor
  value lookup, regression-corpus caching in CI (#3).

v0.1.0

Initial release of deadline, cancellation, derivation, request-scoped values, listeners, and lazy expiration for PHP.