Ensure governance parameter updates are atomic

[Baskarayelu]

Ensure governance parameter updates are atomic

Description

• Multi-parameter update flows can leave partial state when one validation fails mid-sequence.

Requirements and context

• Apply all-or-nothing semantics to grouped config updates.
• Keep validation deterministic.

Suggested execution

• Validate full payload first, then apply updates.
• Revert entire transaction on any invalid field.

Test and commit

• Add tests for mixed valid/invalid update payloads.
• Verify no partial state change on revert.

Example commit message

• fix(contracts): make grouped governance updates atomic

Guidelines

• Avoid external calls during configuration writes.
• Emit events only after successful full apply.

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[Tijesunimi004]

@Tijesunimi004 has applied to work on this issue as part of the Stellar Wave Program's 3rd wave.

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