Add fixes from Spearbit review + Recon invariant tests

[github-actions[bot]]

Coverage after merging spearbit into main will be

99.70%

Coverage Report

File	Stmts	Branches	Funcs	Lines	Uncovered Lines
src
Auth.sol	100%	100%	100%	100%
CentrifugeRouter.sol	89.39%	53.85%	100%	99.08%	102, 117, 117, 128, 128, 145, 189, 200, 200, 294, 302, 307, 309, 323, 51, 58, 58, 58, 85
ERC7540Vault.sol	96.22%	76.67%	100%	100%	105, 133, 138, 145, 145, 250, 263
Escrow.sol	100%	100%	100%	100%
InvestmentManager.sol	98.35%	93.06%	100%	100%	323, 354, 359, 488, 559
PoolManager.sol	98.96%	97.98%	96.43%	100%	216, 437
Root.sol	98.65%	94.44%	100%	100%	32
src/admin
Guardian.sol	92.59%	100%	100%	85.71%	65–66
src/factories
ERC7540VaultFactory.sol	100%	100%	100%	100%
TrancheFactory.sol	100%	100%	100%	100%
TransferProxyFactory.sol	100%	100%	100%	100%
src/gateway
GasService.sol	100%	100%	100%	100%
Gateway.sol	95.75%	85.71%	100%	100%	171–172, 176, 218, 261, 261–262, 308, 325, 74, 76
src/gateway/adapters/axelar
Adapter.sol	100%	100%	100%	100%
Forwarder.sol	100%	100%	100%	100%
src/token
ERC20.sol	100%	100%	100%	100%
RestrictionManager.sol	100%	100%	100%	100%
Tranche.sol	92.59%	62.50%	94.44%	100%	108, 123, 97