Complete Perl ithread lifecycle compatibility - #966
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Finish the remaining Perl-compatible ithread ownership and lifecycle work on both execution backends. Preserve END and CLONE_SKIP behavior, weak backrefs, rescued DESTROY graphs, method-return lifetimes, and child CODE/result cleanup across runtime snapshots and joins. Complete shared aggregate proxy lifetime and lexical reassignment semantics, including alias-aware reference counts and B::REFCNT behavior. Keep nested weak cleanup precise enough to preserve rescued DBIx::Class schema graphs while releasing stale storage callback links. Replace the phased concurrency history with the current implementation and release contract. Historical decisions and completed work remain recoverable from this commit and the preceding pull requests; direct regex-language and Joni work remains in the separate Phase 36 project. Validation: - make: green across all unit shards - make check-links: 393 links OK, 0 errors - new system-Perl regressions: 8 files, 26 assertions, PASS - threads/threads-shared/Thread-Queue/Thread-Semaphore: 64 files and 1,891 assertions in each JVM/platform, JVM/virtual, interpreter/platform, and interpreter/virtual configuration - DBIx::Class: 325 files and 42,681 assertions, PASS with --jobs 8 - thread preservation matrix: no timeouts; thread-owned core, Storable, Test2, debug, and property-race gates pass; regex wrappers equal or exceed their same-build direct companions Generated with [Codex](https://openai.com/codex) Co-Authored-By: Codex <codex@openai.com>
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Summary
Validation
make— green across all unit shardsmake check-links— 393 links OK, 0 errorsthreads,threads-shared,Thread-Queue, andThread-Semaphoredistributions — 64 files, 1,891 assertions in each of JVM/platform, JVM/virtual, interpreter/platform, and interpreter/virtual configurations./jcpan --jobs 8 -t DBIx::Class— 325 files, 42,681 assertions, PASSThe final post-rebase
makeand DBIx/distribution gates are rerun against currentorigin/masterbefore this PR is opened.