Language: E_DEPRECATED on false→array dim write (#22828)

[PurHur]

Summary

• Emit Zend’s E_DEPRECATED: Automatic conversion of false to array is deprecated when FETCH_DIM_W / []= auto-vivifies a false container (zend_execute.c), then promote to [] as before (Language: $false[] = $v fatals — Zend promotes false to array like null (Zend/zend_execute.c) #22650).
• Null/undefined stay silent; true/scalars still Error.
• VM via ErrorReporter::internalDeprecated; JIT via DynamicPropertyDeprecationGuard::emitFalseToArray.
• Compliance + repro guards; spine footnote sync 6503→6512 (inventory already 6512).

Closes #22828

php-src reference

• Zend/zend_execute.c / Zend/zend_vm_def.h — assign-dim / fetch-dim-w false→array deprecation

Test plan

• Issue repro (handler + stderr)
• vendor/bin/phpunit --filter 'append_false_to_array_deprecated|append_false_promotes_array'
• php script/bootstrap-inventory.php --check → OK 6512/6512

Verification

$ php bin/vm.php test/repro/issue_22828_false_append_deprecated.php
false_append_deprecated_ok
array
true_still_fatal_ok

$ php /tmp/fa.php 2>&1 | head -1
PHP Deprecated:  Automatic conversion of false to array is deprecated in /tmp/fa.php on line 4
$ php bin/vm.php /tmp/fa.php 2>&1 | head -1
PHP Deprecated:  Automatic conversion of false to array is deprecated in /tmp/fa.php on line 3

$ vendor/bin/phpunit --filter 'append_false_to_array_deprecated|append_false_promotes_array'
OK (4 tests, 4 assertions)

$ php script/bootstrap-inventory.php --check
OK 6512/6512

Trust probe (pre-claim)

• user_release_ready: no — north-star5-fast red at 4f-m gen-0 manifest/driver mismatch (Self-host M5: bootstrap-inventory argv driver size floor — grow beyond 451KB stub #8713 / Gen-1+ #1492: committed gen-0 seed cannot be rebuilt — refresh OOMs at 48 GiB, 44 restamps since the blob last changed (script/bootstrap-refresh-gen0-sidecar.sh) #22642 in flight); inventory/spine/vm-driver-probe ok. This PR does not touch gen-0 blobs.

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