Bootstrap Phase C: TYPE_THROW JIT + require_chain link (#57, #120)

[PurHur]

Summary

• Implement minimal TYPE_THROW JIT lowering (abort() + LLVM unreachable) and register libc abort in the JIT module.
• Add TYPE_CAST_STRING JIT via JitNativeString::coerce so (string) casts in require_chain/main.php compile.
• Promote test/bootstrap-aot/throw_logic.php and test/bootstrap-aot/require_chain/main.php to aot_link_targets (removed from $pendingUserFunc).
• Update throw_logic fixture to use an in-file BootstrapThrowMarker class (avoids unresolved \LogicException at link time).
• Regenerate docs/bootstrap-profile.json — 9 Phase C link targets; make bootstrap-aot-link passes locally.

Test plan

• php script/bootstrap-profile.php --check
• ./script/bootstrap-aot-link.sh (9 targets OK)
• vendor/bin/phpunit test/unit/BootstrapProfileTest.php
• CI green

Closes #57 (throw terminal link path). Contributes to #120 (require_once chain link).

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