Clean up current documentation and preserve historical evidence

[mzored]

Visitors had to read release narratives and completed launch material alongside current guidance. The README is now a short entry point, the owner guide holds detailed usage, and a documentation index maps current guidance, evaluation data, and immutable historical sources.

Current decision premises, receipt requirements, dated claims, confirmed failures, and unverified limits remain inspectable. Contribution policies move to .github, discovery cases move to evals, and the relocated contribution guide retains its personal-path protection. The installable package changes only its version metadata to 6.3.4.

Validation:

• Full local scripts/check.py and staged git diff --check passed; 222 targeted tests passed during editing.
• The new portability regression fails with the former scanner location and passes with the relocated guide covered.
• Additional acceptance checks verified 93 current/archive section links, unchanged receipt and fixture bytes, an unchanged moved discovery catalog and code of conduct, the complete current decision table, receipt schema, per-claim outcomes, and limitations.
• GitHub resolved the immutable pre-cleanup sources at 72aef4540d30d3639a2f63af6663971345c6dc5a with their original Git object identities.
• Local Claude strict schema validation passed. The Codex validator is unavailable locally; CI runs the existing pinned validator. Clean installs and model sessions were not run and remain UNVERIFIED.

The first full local attempt inherited a global pytest basetemp setting that conflicted with nested pytest calls. Removing that launch setting resolved the failures without source changes; the final gate uses a task-owned temporary directory.

Release publication and site deployment follow the existing tag workflow after reviewed integration and revision-bound CI.

Independent read-only review approved the candidate with no qualifying material findings. Reviewed staged-diff SHA-256: 77f2d40166cc37d4796a29aafe3e4d9a51f2211c5db1fdfaf6f048a3ee5c12e5; committed tree: 6734d7a1a4c608298c1b0af55c2bd81121ad88e4. The reviewer inspected existing evidence and did not repeat verification.