Audit/stellar wraith names

[sudo-robi]

closes #4

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[truthixify]

The audit work itself looks good. The Medium finding on update_internal publishing a register symbol (so indexers can't distinguish updates from new registrations) is a real catch and the recommendation is concrete. Audit doc is at the right path (audits/2026-05-author.md) matching #34's pattern, and the proptest snapshots are correct to commit for CI determinism.

Blocker is the same as your #30: this PR was opened against an older main and now conflicts hard with develop. The diff currently shows it removing or rewriting:

• EVENT_TOPIC_DESIGN.md, ANNOUNCEMENT_SCHEMA.md, POSTMORTEMS.md, MAINNET_READINESS.md
• scripts/rescue-stealth-funds.ts and friends
• The announcer + sender audit reports
• The tests/properties.rs proptest harnesses
• The stellar-nightly CI job

Please rebase onto develop:

git fetch origin
git rebase origin/develop
git push --force-with-lease

Keep all the existing files listed above. Your audit doc and tests/audit.rs go in alongside them. Snapshots under stellar/wraith-names/test_snapshots/ are fine to keep as new files.

Once rebased I will re-review and merge. Thanks @sudo-robi.