Porting the TypeScript tests into solidity

[brickpop]

Description

• Porting the testing suite from TypeScript /HardHat) into native solidity (Foundry)
• Consolidating OSx + the former osx-commons
• Extending the testing coverage (unit, integration, smoke)

Also:

• Syncing the docs (to pass the checks)
• Syncing the ABI (to pass the checks)
• Syncing just-foundry

[xavikh]

Solid port overall: builds clean, 896 tests pass. Detailed findings are inline. One thing up front that needs a call before merge:

Managing-DAO post-deployment checks were dropped with no replacement. The old deploy/managing-dao.ts (7 cases) verified the live managing DAO holds ROOT on itself and upgrade permission over the registries/registrars. A fork test against mainnet is the natural home (the pattern already exists in test/framework/member/fork/). Land it here or as a follow-up?

[brickpop]

Managing-DAO post-deployment checks were dropped with no replacement. The old deploy/managing-dao.ts (7 cases) verified the live managing DAO holds ROOT on itself and upgrade permission over the registries/registrars. A fork test against mainnet is the natural home (the pattern already exists in test/framework/member/fork/). Land it here or as a follow-up?

These tests belong in the Protocol Factory, since it is what does the whole orchestration of Core + Plugins. The Management DAO cannot exist without the Multisig plugin setup being available I wouldn't introduce downstream dependencies here.