docs(governance): add CAC Governance Foundation & certification authority blueprint

[BrianCLong]

Motivation

• Separate CAC standard stewardship from Summit to remove vendor control perception and enable regulator and auditor trust.
• Provide a credible, auditable certification authority and anti-capture governance model to accelerate enterprise adoption.
• Preserve Summit strategic influence while preventing fragmentation and ensuring multi-stakeholder legitimacy.

Description

• Add docs/governance/CAC_GOVERNANCE_FOUNDATION_AND_CERTIFICATION_AUTHORITY.md, a six-part blueprint covering foundation structure, standard ownership, certification authority design, ecosystem roles, trust/audit controls, and a 0–180 day transition plan.
• Update docs/roadmap/STATUS.json to register the CAC governance-foundation initiative as completed and refresh last_updated and summary metadata.
• This is a documentation-only change that does not modify runtime code, libraries, or CI policies.

Testing

• Validated docs/roadmap/STATUS.json formatting with python -m json.tool docs/roadmap/STATUS.json, which succeeded.
• Verified presence of the new governance document and that the roadmap metadata reflects the added initiative; no code tests were required for this docs-only change.

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Codex Task

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⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 610e82a2-0ff4-48f3-bfd7-e21d5b15def0

📥 Commits

Reviewing files that changed from the base of the PR and between e87382b and 73e32ac.

📒 Files selected for processing (2)

• docs/governance/CAC_GOVERNANCE_FOUNDATION_AND_CERTIFICATION_AUTHORITY.md
• docs/roadmap/STATUS.json

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/create-cac-governance-foundation-structure

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