WIP Added pause and unpause

[naddison36]

Summary

• Added a shared ARM pause circuit breaker in AbstractARM.
• Operator or owner can call pause().
• Only owner/governor can call unpause().
• Paused state blocks user-facing flows: swaps, deposits, and new LP redeem requests.
• Operational/recovery flows remain available while paused, including claims, allocation, price/buffer updates, fee collection, and base-asset redeem/claim.

Tests

• forge inspect src/contracts/AbstractARM.sol:AbstractARM storage-layout
• forge test --match-path test/unit/OriginARM/Pause.sol -vvv
  • 17 passed
• forge test --match-path 'test/unit/OriginARM/*.sol' -vvv
  • 130 passed
• forge build
  • Passed with existing unused-variable warnings in script/deploy/mainnet/000_Example.s.sol
  • Non-fatal Foundry signature cache permission warning

Contract Sizes

From forge build --sizes:

Contract	Runtime Size	Runtime Margin
OriginARM	24,185 B	+391 B
EthenaARM	24,514 B	+62 B
LidoARM	25,073 B	-497 B
EtherFiARM	25,165 B	-589 B

Note: forge build --sizes exits non-zero because LidoARM and EtherFiARM exceed the EIP-170 runtime size limit.