docs: record canonical Production cutover evidence

[Alex0158]

Summary

• record the verified canonical Production URL/CORS/static-bundle cutover at 534217d
• separate completed Web/Admin/backend release evidence from remaining mailbox and Mobile artifact evidence
• refresh the operational runbook and agent platform map without archiving the still-open task

Verification

• git diff --check
• npm run docs:check
• npm run naming:check

Release note

This is evidence-only, but merging advances main; after exact-main CI succeeds, run the formal Production Deploy and Verify workflow so live version endpoints remain aligned with main.