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Section 10: add PR #786 BOM canary check that verifies detect_hidden_chars() is functional before trusting ref validation results. Injects exact U+FEFF pattern from the known-bad branch name. Section 10: add emit_ref_finding() helper with raw hex dump and diagnostic category output. Makes invisible bytes forensically visible in the step summary. Section 6: upgrade unsanitized write listing from bullet list to table with File, Line, and Content columns. Fix: add elements-sanitized marker to Windows Section 10 Out-File write (closes 105/105 gap). Tested: 84/84 pass against xsscx/fuzz full-unicode.txt corpus (5.5MB, all 8 detection categories verified). Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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…tics - sanitize-sed.sh v4: detect_hidden_chars() (8 categories), validate_ref() - sanitize.ps1 v4: Detect-HiddenChars, Validate-Ref (PowerShell parity) - ci-pr-risk-security-analysis.yml: Section 6 table output, Section 10 canary check (PR #786 BOM pattern), emit_ref_finding() with hex dump - ci-pr-action.yml: ref validation using detect_hidden_chars - test_sanitization.sh: version v3->v4 fix, grep pipefail guard Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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#785