PyneComp v6.0.45 — better compile errors: human-readable messages with precise source…

Fixes

• Syntax errors now describe what was found instead of dumping internal token names — e.g. Unexpected ‘,’. or Unexpected identifier ‘foo’. rather than COMMA_ARGS; lexer error messages improved as well
• Unified diagnostics with consistent source range tracking across the parser, so errors report tighter, more accurate positions
• Assignment targets with dotted names (a.b := x) now carry precise per-segment source spans, and existing operation spans are preserved instead of overwritten