Release v1.5.1

Summary

A quality-assurance pass of the invoicing showcase sample against the actual language definitions, and of the projection documentation against the parser. The sample no longer teaches redundant or rejected forms, and the auto-map/grammar pages now describe exactly what the parser accepts.

Fixed

• The invoicing sample no longer uses a redundant projection-level automap — AutoMap is the default
• The invoicing sample uses every instead of all for per-projection mappings, and showcases all in a new SystemActivity slice matching its documented system-wide semantics
• The invoicing sample no longer points a projection at a named sequence its own events never reach
• The invoicing sample maps arithmetic counters only from events that carry the referenced property, imports every external event it references, and uses the documented = mapping and plain string literals
• The auto-map documentation no longer shows an event-level no automap the parser rejects, and its join and children examples use the actual with and identified by forms
• The projection grammar documents the per-with AutoMap toggle and the sequence directive, and its closing example uses the real join syntax

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