docs(handoff): record vendor control tower rollout

[petterlindstrom79]

Summary

• record the production Vendor Control Tower rollout and German company-data suspension
• preserve Browserless credential-recovery evidence, zero-cost verification, and guarded September 7 restoration conditions
• list remaining monitoring coverage and pre-existing close-check warnings for future sessions

Verification

• documentation-only handoff
• git diff --check — passed
• matching Notion Journal session entry created

Reviewer findings

• docs-only close-out artifact; code review gate exempt under AGENTS.md

Test plan

• confirm the handoff path is searchable and contains the three shipped PRs plus current production state