PQC readiness docs

[bsanchez-the-roach]

DOC-16026

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[github-actions]

Files changed:

• src/current/cockroachcloud/cmek.md
• src/current/v26.2/authentication.md
• src/current/v26.2/encryption.md
• src/current/v26.2/security-reference/encryption.md
• src/current/v26.2/security-reference/security-overview.md
• src/current/v26.2/security-reference/transport-layer-security.md
• src/current/v26.2/take-and-restore-encrypted-backups.md

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[github-actions]

Diagram Anchor Check: Failed

Found 11 broken anchor(s) that will cause docs build failures.

Context: EDUENG-613 — same failure mode as 2026-01-29 (opt_with_show_hints_options missing from stmt_block.html).

• rollback_transaction.html on release-26.1 → missing anchor #savepoint_name
  • referenced by src/current/v26.1/rollback-transaction.md
• set_local.html on release-26.1 → missing anchor #var_name
  • referenced by src/current/v26.1/set-vars.md
• set_local.html on release-26.1 → missing anchor #var_value
  • referenced by src/current/v26.1/set-vars.md
• set_session.html on release-26.1 → missing anchor #var_name
  • referenced by src/current/v26.1/set-vars.md
• set_session.html on release-26.1 → missing anchor #var_value
  • referenced by src/current/v26.1/set-vars.md
• rollback_transaction.html on release-26.2 → missing anchor #opt_transaction_chain
  • referenced by src/current/v26.2/rollback-transaction.md
• rollback_transaction.html on release-26.2 → missing anchor #savepoint_name
  • referenced by src/current/v26.2/rollback-transaction.md
• set_local.html on release-26.2 → missing anchor #var_name
  • referenced by src/current/v26.2/set-vars.md
• set_local.html on release-26.2 → missing anchor #var_value
  • referenced by src/current/v26.2/set-vars.md
• set_session.html on release-26.2 → missing anchor #var_name
  • referenced by src/current/v26.2/set-vars.md
• set_session.html on release-26.2 → missing anchor #var_value
  • referenced by src/current/v26.2/set-vars.md