LSP Diagnostics Volume Limiting

What: LSP diagnostics are now limited to 10 per file and 30 total, sorted by severity to preserve the most important issues.

Details:

• Constants D21 = 10 (per file) and RG2 = 30 (total) at line 341029
• Severity sorting via TG2() at line 340898: Errors → Warnings → Info → Hints
• Cross-turn deduplication prevents same diagnostic from appearing repeatedly
• Diagnostics cleared when file is modified via H21() at line 341024
• Evidence: SG2() at line 340948, rIA tracking map at line 341032