Add end-of-life, data residency, data deletion, and consent management policies

[zainabbaba31-source]

Summary

Adds four data and lifecycle governance policies, all self-contained inside
Governance/policies/. Each is a versioned policy with an owner, review cadence,
and change log, consistent with the existing Governance/ documents.

File	Covers
Governance/policies/END_OF_LIFE.md	How EOL is decided and announced, the support-reduction stages, and migration guidance.
Governance/policies/DATA_RESIDENCY.md	Where data may be stored, the transfer restrictions, and the exception process.
Governance/policies/DATA_DELETION.md	How deletion/erasure requests are handled, the timelines, and identity verification.
Governance/policies/CONSENT_MANAGEMENT.md	What requires consent, how consent is recorded, and how it is withdrawn.

Scope

• Documentation only. No TypeScript, configuration, schema, or dependency is
  touched.
• All changes live under Governance/policies/; nothing outside Governance/ is
  modified.
• Governance/ is outside the Jest root and the TypeScript build, so no test,
  build step, or runtime path is affected.

Notes

• Regression tests are not applicable: this is a documentation-only change with
  no executable code.
• Cross-references point at existing Governance/ documents (DOMAINS/,
  compliance/DPA_TEMPLATE.md, policies/DEPRECATION.md, policies/VERSIONING.md,
  SECURITY_POLICY.md, and others).

Closes #1852
Closes #1855
Closes #1856
Closes #1857

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