Closes supervisorphp#1, closes supervisorphp#34. ## Core fix: tail log methods tailProcessStdoutLog() and tailProcessStderrLog() were routed through __call() and returned a raw array [bytes, offset, overflow] with no indication of what each index contained. This made the methods unusable without reading the Supervisor API documentation directly. - Introduce TailLogInterface and TailLog value object following the existing ReloadResult pattern - Add explicit tailProcessStdoutLog() / tailProcessStderrLog() methods on Supervisor and SupervisorInterface, returning TailLogInterface - Add TailLogSpec (5 examples) and SupervisorSpec coverage for both methods - Document the offset-based iteration pattern in README and clarify that FailedException (fault 30) is thrown when the process log file does not exist yet - Remove outdated notice about the PHP XML-RPC extension ## Typed DTO for getState() getState() previously returned a raw array via __call(). Introduce StateInfo and StateInfoInterface (statecode + statename), following the same pattern as TailLog. Update getServiceState() to delegate to getState()->getStateCode(). ## Bug fixes - Process::checkState() and Supervisor::checkState(): return false explicitly when ServiceStates/ProcessStates::tryFrom() yields null for an unknown int, instead of comparing an enum to null silently - Remove unused ReloadExceptions import from Supervisor and SupervisorInterface (class does not exist) - isConnected(): log the exception message at debug level instead of discarding it silently - Process::offsetGet(): throw OutOfBoundsException on unknown key instead of returning null silently ## Code quality - Normalise @method docblocks: integer/boolean -> int/bool - Fix duplicate docblock on ProcessInterface::getState() - Remove unused ReturnTypeWillChange import from Process - Set minimum-stability to stable in composer.json - Annotate array parameters with generic types for PHPStan level 8 compatibility (array<int, mixed>, array<string, mixed>, list<string>, array shapes, class-string<SupervisorException>) - Extend CI matrix to PHP 8.1, 8.2, 8.3 and 8.4 ## Tests - Add ReloadResultSpec: fromReloadConfig() parsing, null-safe fallback, getAffected() merge (7 examples) - Add 5 specs for reloadAndApplyConfig(): removed groups, modified groups with and without stopModifiedGroups flag, added groups with and without startNewProcesses flag - Add StateInfoSpec (5 examples) Signed-off-by: Guillaume Delré <delre.guillaume@gmail.com>

[FROM TODO] The current implementation does not work with log tailing #1

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