chore: drop stale maintainer_gap repros for closed issues (jul05 wave23)

[PurHur]

Summary

• Remove 58 test/repro/maintainer_gap_* filing scripts for issues closed since wave22 (chore: drop stale maintainer_gap repros for closed issues (jul05 wave22) #16416).
• All repros verified green on master via ./script/docker-exec.sh VM probes (profile-gated where needed).
• Each maps to an existing compliance .phpt or unit test guard — no open issue repro paths removed.

Issues covered (sample)

#16651, #16652, #6693, #4512, #5964, #7270, #8689, #9471, #16512–#16577 cluster, #16488–#16495, profile forward gates (#16675, #16676), etc.

Hygiene notes

• agent/ branches: 67 without open PR but all touched after 2026-06-28 — no >7d branch deletes this run.
• Duplicate tracking comments on Stdlib: fpow()/fmin()/fmax()/nextafter() — callable on PHP_COMPILER_PROFILE=8.4 but function_exists false (BuiltinIntrospectionPolicy, ext/standard/math.c) #16677 (vs closed Stdlib: PHP 8.4 forward-profile gated builtins — function_exists/extension_loaded true on reference profile (ext/standard) #16086) and Language: Closure::getCurrent() — static method missing (PHP 8.4, Zend/zend_closures.c) #16642 (vs closed Regression: Closure::getCurrent() — method_exists true on Zend 8.2 reference profile (re-#13981, Zend/zend_closures.c) #14221 phantom).

Test plan

• php script/bootstrap-inventory.php --check
• VM batch probes on deleted repro set (pre-delete)
• ./script/ci-fast.sh (inventory + spine; no compiler logic changed)

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