Chore: drop uncited closed-issue repro for #22717

[PurHur]

Summary

• Remove test/repro/issue_22717_vmmbstring_late_static_method_aot.php — GitHub issue Bootstrap: unblock gen-0 spine refresh — docblock, ghost require, exclusive launcher (#22642) #22717 is closed (2026-07-25), and the basename/#22717 is not cited by unit/compliance/docs/scripts or any open re-#22717 issue.

Hygiene (same run)

• Unclaimed stale batch claims (no open PR / no branch): Regression: AOT GlobIterator foreach compile fails — undefined method object::getfilename() (ext/spl/spl_directory.c) #27422, Regression: AOT CachingIterator foreach prints empty — VM/JIT match Zend (ext/spl/spl_iterators.c) #27421, Regression: AOT RegexIterator yields empty — VM/JIT match Zend (ext/spl/spl_iterators.c) #27313, Regression: AOT CallbackFilterIterator yields empty — VM/JIT match Zend (ext/spl/spl_iterators.c) #27259
• Closed Regression: AOT base_convert() segfaults after build — VM/JIT match Zend (re-#26997, ext/standard/type.c) #27405 after re-verify: AOT base_convert("ff",16,10) → 255 (10/10)
• Deleted local merged branch chore/cleanup-stale-repros-closed-26628-27665 (remote already gone)
• Kept open-issue WIP remotes: agent/stdlib-26829-…, agent/advanced-stdlib-27206-…, fix/27423-… (<7d, issues open)

Test plan

• Confirmed Bootstrap: unblock gen-0 spine refresh — docblock, ghost require, exclusive launcher (#22642) #22717 CLOSED
• Confirmed no open re-#22717
• Confirmed no unit/compliance/docs/script cite of #22717 / basename outside test/repro
• N/A compiler gates (deletion of closed-issue agent repro only)

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