Language: declare(ticks=N) braced statement cadence (#22840)

[PurHur]

Summary

• php-cfg parseStmt_Declare now parses braced declare(ticks=N) { … } bodies and emits LeaveTickInterval so the tick interval restores after the block (previously the body was dropped — under-fire).
• Compiler emits TYPE_TICKS before tickable CFG statements while CG(declarables).ticks-equivalent compile state is active; VM runs tick callbacks only on that opcode (Zend statement cadence, not per-opcode).
• php-src-strict: Zend 8.2 fixture n=3 / n2=2 matched on VM.

Closes #22840

php-src reference

• Zend/zend_execute_API.c — tick handlers
• Zend/zend_compile.c — declare(ticks=N) / declarables.ticks

PHP implementation

• Overlay: patches/overlays/php-cfg/Op/Terminal/{SetTickInterval,LeaveTickInterval}.php + script/apply-patches.sh
• Lowering: lib/Compiler.php (TYPE_TICKS, scoped ENTER)
• Dispatch: lib/VM.php (TYPE_TICKS → maybeRunTick)

Test plan

• Issue repro Zend vs VM
• test/compliance/cases/language/declare_ticks_statement_cadence.phpt
• Existing declare_ticks / register_tick_function compliance

Verification

./script/docker-exec.sh -- bash -lc 'php test/repro/ticks_per_statement_22840.php; php bin/vm.php test/repro/ticks_per_statement_22840.php'
# Zend+VM: n=3 / n2=2

./script/docker-exec.sh -- bash -lc 'php -d memory_limit=1536M vendor/bin/phpunit --filter "declare_ticks|register_tick_function" test/compliance/VMTest.php'
# OK (3 tests, 3 assertions)

Pillar note: host release-readiness still has north-star5-fast red via #22642 gen-0 fingerprint (pre-existing); this PR is language/VM-only.

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