Summary

• Adds CC9.2 vendor concentration and exit-readiness evidence to SOC 2 gap analysis.
• Covers critical vendor tiering, concentration analysis, exit plans, portability tests, subservice dependencies, owner/review cadence, and risk acceptance.
• Adds a Critical Vendor Exit Matrix deliverable.
• Links implementation to review issue [REVIEW] soc2-gap: add critical vendor concentration and exit evidence gates #2239.

Validation

• Confirmed markdown code fences are balanced.
• Checked the new version, vendor exit section, exit matrix deliverable, and changelog are present.

Bounty request: Improver Moderate ($100) if accepted. I can provide payment details if accepted.