Clamp session diagnostics browse names

[kevinherron]

Motivation

• Creating diagnostics nodes used the raw client-controlled session name as a QualifiedName BrowseName which throws an unchecked IllegalArgumentException for names over 512 characters and could leak sessions/nodes leading to DoS.

Description

• Add MAX_BROWSE_NAME_LENGTH = 512 and a helper sessionNameBrowseName(String) to truncate session names to the QualifiedName limit before constructing the BrowseName.
• Use the truncated value for sdoNode.setBrowseName(...) while preserving the original session name for setDisplayName(...) so presentation is unchanged.
• Add focused unit tests SessionsDiagnosticsSummaryObjectTest that verify valid names are preserved and overlong names are truncated and accepted by QualifiedName.

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Codex Task