Merge bitcoin/bitcoin#27921: fuzz: Avoid OOM in transaction fuzz target

[DashCoreAutoGuix]

Backports bitcoin#27921

Original commit: f1b4975

Backported from Bitcoin Core v0.26

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📥 Commits

Reviewing files that changed from the base of the PR and between e7f515c and b4e0817.

📒 Files selected for processing (1)

• src/test/fuzz/transaction.cpp (1 hunks)

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[DashCoreAutoGuix]

✅ Backport Verification Successful

No issues found! This backport is complete and faithful to the original Bitcoin change.

Original Bitcoin commit: f1b4975461
Backport PR: #831
Reviewed commit hash: b4e0817592-verify-1754067959

Verification Details:

• File operations match Bitcoin's intent
• No missing changes detected
• No scope creep or dependency explosions
• CI checks passing (36/36)
• PR comments reviewed and addressed

Reviewer Feedback Analysis:

PastaPastaPasta comments reviewed: 0
Other human comments reviewed: 0

No reviewer feedback found - PR is ready for automated verification completion.

Technical Analysis:

• Size ratio: 115.4% (well within 80-150% acceptable range)
• Files changed: Bitcoin: 1, Dash: 1 (perfect match)
• Witness code check: No Bitcoin-specific patterns detected
• File operation validation: No violations found
• CI status: All 36 checks passing

This PR is ready for merge. ✅