Docs: wave-3 tracker and issue sync (#1380)

[PurHur]

Summary

• Add docs/roadmap-wave3.md with status/PR links for issues Language: PHP 8 attributes (#[Attr] on classes, methods, properties) #1354–Stdlib: set_error_handler() — VM + LLVM JIT/AOT #1379
• Regenerate docs/stdlib-jit-audit.md after wave-3 stdlib merges
• Update docs/pages/development-status.md and README (local CI, stdlib progress)
• GitHub Roadmap wave 3: full PHP language + stdlib gaps tracker (#1354–#1379) #1380 body updated; closed JIT: Variable variables ($$name) in LLVM lowering #1364; commented on Stdlib: debug_backtrace() — VM + LLVM JIT/AOT #1378 / Stdlib: debug_backtrace() VM minimal stack trace (closes #1378) #1404

Test plan

• Doc-only change

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