docs(governance): add moderation policy

[244345]

Summary

• add a versioned moderation policy under Governance/policies/
• define moderation principles, available actions, urgent safety handling, and moderator limits
• document transparency, records, notice, reconsideration, conflicts, and policy relationships

Validation

• git diff --check
• documentation-only change; no application tests required

Closes #1595

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[244345]

@RUKAYAT-CODER @244345 Implemented and pushed the moderation policy in bc4b90b2. It defines moderation principles, available actions, urgent safety handling, transparency, records, reconsideration, and moderator limits, scoped to Governance/. Closes #1595 is included in the PR body.

[RUKAYAT-CODER]

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