🛡️ Sentinel: [MEDIUM] C0 CSV prefix bypass — superseded by #1103

[seonghobae]

Disposition: complete semantic succession into #1103

Fresh comparison against canonical desktop CSV security owner #1103 found one valid unique product delta here: the non-whitespace C0-control bypass represented by \x1B+SUM(A1). This PR’s broader regex could not be merged wholesale because it would drop #1103’s already-preserved NUL-only and full-width operator contracts.

The valid delta is now reconstructed on canonical #1103 rather than discarded:

• canonical RED 754fa51b69a2718346161e38228937c84f98d241 covers ESC-prefixed formula-shaped input, whitespace + BEL, and C0-only input in addition to the existing NUL/full-width regressions;
• canonical causal fix 12043a9c870fe673a741b9285dabcf4d69764fe9 treats every leading C0 control (\x00-\x1F) as a dangerous first token while retaining ASCII and full-width formula initiators;
• canonical non-force protected-base adoption 419651fdee22f4575fc91ff313e3fec91eff7efb brings current protected develop@314ddeae7b775a4957594b599358c8255617eb2e into ancestry without changing the three-file security semantic delta;
• canonical documentation head 71c27721e01fd7d0fd62382f39daa1e6a1646ab4 records the actual C0 trust boundary in the existing Sentinel learning note.

#1171’s services/analysis-engine/tests/test_supply_chain_policy.py change is formatting-only and carries no behavioral/test/fixture/contract requirement. Its .jules learning is represented by the stronger canonical C0 note. There are no submitted reviews or inline review threads on this PR, and no check/review/status evidence is transferred to #1103.

This PR is therefore closed only after all valid unique semantic/test/documentation delta has been carried by the verified canonical successor source. #1103 remains Draft and must earn fresh exact-head protected CI/security/coverage/build/review evidence independently.

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📥 Commits

Reviewing files that changed from the base of the PR and between 314ddea and 03fa819.

📒 Files selected for processing (4)

• .jules/sentinel.md
• apps/desktop/src/lib/export.test.ts
• apps/desktop/src/lib/export.ts
• services/analysis-engine/tests/test_supply_chain_policy.py

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