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## Why The standalone installer validates package checksums with an awk interval expression. Older mawk releases do not support that expression, so they reject valid 64-character digests and report that the release manifest is missing an entry. This affects both x64 and ARM64 systems on common Debian-derived environments. Fixes #24219. ## What Changed Replace the awk interval expression with an explicit length check plus rejection of non-hexadecimal characters. This preserves the existing SHA-256 validation and lowercase normalization while working with older awk implementations. ## How to Test 1. Build and run the checksum predicate with mawk 1.3.4 20121129. 2. Confirm the old interval predicate rejects a valid 64-character digest. 3. Confirm the updated predicate accepts that digest. 4. Put the old mawk binary first on PATH as awk and run scripts/install/install.sh with an isolated HOME, CODEX_HOME, and CODEX_INSTALL_DIR. 5. Confirm Codex installs successfully and the installed binary reports version 0.140.0. 6. Verify the predicate rejects wrong-length digests, non-hexadecimal digests, and entries for another asset while accepting uppercase hexadecimal digests.