Fix Unicode identifier parsing and related runtime Unicode handling #149
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Summary\n- Make lexer code-point aware for Unicode identifiers (surrogate pairs).\n- Validate identifiers using Unicode XID properties and UTF-8 byte length limits.\n- Fix
substr/lvalue substring operations to operate on Unicode code points.\n- Improve parser diagnostics (e.g.forloop variable error).\n- Fix strict-vars handling for special sort vars/to avoid aborting regex test files under strict.\n\n## Test results\n-make: PASS\n-perl dev/tools/perl_test_runner.pl perl5_t/t/comp/parser.t: improved (73/193)\n-perl dev/tools/perl_test_runner.pl perl5_t/t/uni/variables.t: improved (66764/66880)\n-perl dev/tools/perl_test_runner.pl perl5_t/t/re/pat_rt_report.t: unblocked (2379/2514)\n\n## Notes\nNo test files were modified.