docs(audit): record Round 6 - required encryption key and Stripe screenshot removal

[JOY (JOY)]

Records PR #76 (MD-30 + LO-04/LO-05) as Round 6 in the audit report. All 76 findings carry up-to-date status; after this round the only remaining items need either a JOY decision (HI-13/14/16) or fork secrets configuration (HI-10), plus optional perf/cosmetic tails.

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[gemini-code-assist]

Code Review

This pull request updates the audit report HTML document (docs/audit/2026-09-08-audit-report.html) to mark issues MD-30, LO-04, and LO-05 as fixed in Round 6 (PR #76). It adds details regarding the resolution of these issues, including the removal of Stripe secrets and throwing errors when the encryption key is missing. There are no review comments, so I have no feedback to provide.