Fix tuple member-array index capture in Lua

[Frotty]

Summary

• treat member-array index expressions as reads during IM read-variable analysis
• preserve tuple l-value index captures through dead-store elimination
• add a regression covering the reported class-field tuple-array assignment in Jass and Lua

Acceptance criteria

• generated Lua declares and initializes tuple l-value index temporaries before use
• the reported tuple-array assignment executes without a nil-index failure
• Jass transform modes and Lua execution produce the expected stored tuple and slot count

Verification

• ./gradlew test --tests "tests.wurstscript.tests.LuaBackendAuditTests.tupleMemberArrayAssignmentCapturesIndex" — passed
• ./gradlew test --tests "tests.wurstscript.tests.LuaBackendAuditTests" — passed
• ./gradlew test --tests "tests.wurstscript.tests.TupleTests" — passed
• ./gradlew test — passed (6m 13s)
• git diff --check — passed

Known gaps

None.

[chatgpt-codex-connector]

Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-02T08:44:22.175405Z	fbd8179	Manual request

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[Frotty]

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. 👍

Reviewed commit: fbd8179429

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