[codex] Apply public release-control redactions

[Illian-Amerond]

Summary

Applies a controlled academic release posture to public OAN repository surfaces that were carrying reconstruction-enabling detail.

This PR:

• replaces public documentation, corpus payloads, build/readiness ledgers, and fixture data with release-control placeholders;
• neutralizes public audit/test assertions that reproduced withheld body text;
• adds a top-level release-control notice describing the new publication boundary;
• leaves unrelated local adapter files out of scope.

Validation

• dotnet test "D:\OAN Tech Stack\OAN Mortalis V1.1.1\Oan.sln" --no-restore
• dotnet test "D:\OAN Tech Stack\OAN Mortalis V1.2.1\San.sln" --no-restore
• tracked JSON parse sweep passed
• docs/data keyword sweep returns only Unicode database false positives

Notes

The public issue tracker was separately converted to release-controlled academic stubs before this PR. This branch addresses the repository file surface.

This PR does not rewrite historical Git objects. If historical exposure must be removed from public clone history, that requires a separate repo-history remediation plan.