Phase 36: unify regex parity integration

[fglock]

Summary

• integrate all 35 ready Phase 36 regex PRs on one branch
• preserve one squashed review-unit commit per source PR
• retain the repair commits as separate review and rollback units
• retain a merge commit as the final whole-integration rollback boundary; do
  not squash or rebase-merge this PR
• restore PR Fix WWW::Mechanize compiler tooling #958 per-file parity, with exact legacy transcript artifacts
  normalized explicitly

Source PR order

1. Reporting and control foundation: Report full forced regex backend differential #1006, WIP: Complete Phase 36 regex control semantics #1005, Preserve callbacks in apostrophe-delimited regexes #1007, fix: preserve overloaded regex callback provenance #1010
2. Performance and safety lane: perf: reuse Joni subject offset tables #1008, fix: preserve properties inside extended regex sets #1009, fix(regex): enable safe Joni backtracking checks #1012
3. Property/source-policy lane: WIP: Match user Unicode property diagnostics #1011, WIP: Preserve deferred Unicode property provenance #1013, fix: execute inline p modifiers through Joni #1014, fix: preserve regex control escape operands #1015
4. Join point: fix: integrate Joni Unicode and G-position parity #1016
5. Strict integration stack: test: expose lossless Unicode property corpus #1018–feat(regex): add pinned Script parity #1040

Every source PR number appears in its integration commit subject. Original
head SHAs are recorded in the commit messages.

Merge policy

Use Create a merge commit. Keeping the source-PR and repair commits
preserves review, blame, and bisect history, while the merge commit permits a
whole-integration rollback with git revert -m 1 <merge-sha>.

Repair batch

The final integration keeps eleven unsquashed repair commits covering:

• concat-assignment overload, tied-fetch, interpolation, and taint semantics
• named CV replacement and compile-time-displaced CV binding
• byte-backed eval decoding under lexical unicode_eval
• undefined hash-interpolation warnings
• qualified SUPER diagnostics and ordinary glob identity
• active foreach-cell rebinding and canonical interpreter undef
• opt-in normalization of the two exact PR Fix WWW::Mechanize compiler tooling #958 transcript artifacts

Validation

• exactly 35 source-PR commits, one per ready PR
• AI attribution present on every source-PR commit
• duplicate and temporary integration commits excluded
• git diff --check origin/master...HEAD
• corpus comparator tests: original 13/13 plus artifact-normalization 7/7
• authoritative feat(regex): add pinned Script parity #1040 Script stack and protected generated-property gates
• warning-free combined make, including Joni, all five unit shards,
  packaging verification, and shadow jar
• combined 14-file reducer/control gate: 118/118 on JVM and interpreter
• final named-CV/GV correction controls: 21/21 on JVM and interpreter
• op/symbolcache.t restored from 7/8 to 8/8 on both backends
• fresh 622-file acceptance run plus the targeted corrected blocker rerun
• normalized PR Fix WWW::Mechanize compiler tooling #958 comparison: zero regression files, 70 improved,
  550 unchanged, two known environmental flakes excluded, +201,634 passing
  assertions
• focused branch-reset fallback: both pat_advanced variants complete
  1,687 tests at 1,522 passing, +146 each versus PR Fix WWW::Mechanize compiler tooling #958
• exact PR Fix WWW::Mechanize compiler tooling #958 reconstruction classifies op/do.t duplicated TAP and
  japh/abigail.t's logged extra pass as transcript artifacts
• stale forced Java/Joni matrix explicitly transferred to post-Phase 36: unify regex parity integration #1042
  native-migration PR fix(regex): advance native Joni pattern semantics #1052, where expected counts will be established from
  the then-current corpus
• Ubuntu CI
• Windows CI

Evidence

• combined build: /tmp/phase36-pr1042-integrated-make.log
• correction build: /tmp/phase36-pr1042-symbolcache-fix-make.log
• acceptance log: ../PerlOnJava/logs/test_20260818_180000_1042.log
• corrected targeted composite:
  /tmp/phase36-pr1042-acceptance-with-symbolcache-rerun.log
• final normalized comparison:
  /tmp/phase36-pr1042-final-corrected-normalized-compare.log

Review notes

• Current head is 19569d86d565f98372dbfb979174799290be8e0c.
• Ordinary lookbehind and ordinary constant branch-reset/subroutine-call
  routing through Java are temporary merge scaffolding. Explicit Joni,
  callbacks, dynamic patterns, conditions, and control verbs remain Joni.
• Full Joni remains the target architecture; post-Phase 36: unify regex parity integration #1042 native-Joni work is
  intentionally excluded from this release branch.
• The PR remains draft until current Ubuntu and Windows CI pass.
• Existing source PRs should remain open until this unified PR is green.

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