Kernel-backed Chronicle tests and read consistency

[woksin]

Arc for TypeScript 0.25.0 adds kernel-backed Chronicle tests and explicit read consistency, and fixes how Chronicle commands convert identifiers and record causation. npm publication remains disabled, and full .NET parity is not yet available.

Added

• ChronicleKernelScenario in @cratis/arc.chronicle/testing runs commands against a real Chronicle kernel: seed events, execute commands through Arc's pipeline, wait for projections through the kernel's own completion signal, and assert on appended events, read models and constraint violations. The in-memory ChronicleCommandScenario stays the fast default.
• completionTimeoutMs makes a command wait, within a bound, until Chronicle has processed the events it appended, so a query right after the command sees the result.
• ChronicleReadModels reads can ask for immediate consistency for passive projections.
• Guides for kernel-backed testing and for choosing read consistency.

Fixed

• A @subject() field or a getEventSourceId() result holding a Guid or a concept is converted to its string form instead of being ignored or failing the command.
• The causation chain records concept, Guid, Date, DateOnly, TimeOnly and TimeSpan command fields, not only strings, numbers and booleans.