Per-function pause granularity (pause credit vs claim vs redeem independently)

[joelpeace48-cell]

Epic: Contract Safety & Hardening

Summary

Allow pausing specific operation classes instead of the whole contract.

Background & Problem

A blanket pause is blunt; granular pausing lets operators mitigate one issue without freezing everything.

Acceptance Criteria

• Each operation class independently pausable.
• Global pause still available.
• Tested combinations.

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Filed as part of the mainnet-readiness & world-class roadmap. Scope is intentionally small enough for one focused PR; comment to claim.