chore(docs): archive v1-rc1 audit docs to history/

[trilamsr]

Summary

Archives two historical v1.0-rc1 audit snapshots into docs/history/v1-rc1/
so they stop crowding the top-level docs/ listing. v1-rc1-cut-criteria.md
stays in docs/ (load-bearing — see below).

Files moved

• docs/v1-rc1-governance-gaps.md → docs/history/v1-rc1/governance-gaps.md
• docs/v1-rc1-operational-gaps.md → docs/history/v1-rc1/operational-gaps.md
• New: docs/history/v1-rc1/README.md (subdir index, ≤20 lines)

Why cut-criteria.md stayed

scripts/cut_criteria.py:83 pins output path to docs/v1-rc1-cut-criteria.md
(the make cut-criteria-render gate). Three other scripts cite the same path:
scripts/deprecation-check.sh, scripts/attribute-namespace-check.sh,
scripts/rfc-status-check.sh. Moving the file silently breaks the render
parity gate inside make doc-check. The file is generated, not archived —
it stays where the render contract puts it.

Inbound cross-refs updated

• docs/README.md — replaced single entry with history/v1-rc1/ subdir row
• docs/MILESTONES.md — operational-gaps reference under M21
• docs/NORTHSTARS.md — operational-gaps SLSA L3 citation
• docs/reproducibility.md — operational-gaps SLSA L3 citation
• docs/migration/v0.x-to-v1.0.md — operational-gaps §2 upgrade-rollback ref
• docs/2026-Q1-retrospective.md — 6 governance-gaps refs (rubric source)
• docs/audits/wave-2026-06-01.md — row 9 audit comparison row
• docs/followups/M3.md — 3 operational-gaps SLSA references

Internal link depth-shift

Both moved files carried ../foo (repo-root) and bare foo.md (docs-root)
relative links. From the new depth docs/history/v1-rc1/, these were
rewritten to ../../../foo and ../../foo.md respectively; sibling refs
between the two archive files stay bare.

docs: archive v1.0-rc1 governance-gaps + operational-gaps audits under docs/history/v1-rc1/; the live cut-criteria rubric stays at docs/v1-rc1-cut-criteria.md (render-gate path-pinned).

Test plan

• make doc-check green (link gate + cut-criteria render parity + attribute-namespace + RFC-status)
• pre-push hook clean (lint, vet, deprecation-check, attribute-namespace)
• grep audit: zero stale v1-rc1-governance-gaps/v1-rc1-operational-gaps refs outside the archive subdir