Validation, diagnostics, and reload

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Source is UTF-8 and limited to 1 MiB. Validation compiles without execution before a snapshot or reload is sent. Snapshot and reload hashes are verified. During Play, Reload Scripts validates all manifest entries and sends only successful source over authenticated, bounded IPC. Replacement occurs at a simulation boundary. Existing typed properties and runtime transforms remain. Property-schema additions/removals currently require Restart Play; incompatible live replacement is rejected. A failed reload leaves the prior instance running. Restart Play rebuilds the immutable snapshot.

Console records identify process and subsystem, collapse duplicates, filter/search, copy, clear, and open source/stack locations externally. Interactive debugging is not currently claimed.