Revert entire v5 branch to a044f50f

[Siddharth2207]

Summary

• Full revert of the v5 branch to commit a044f50f (NPM Package Release v0.0.1-alpha.201) — the last clean V5 state on main before PR wip on exact swap #2366 (2025-12-18-exact-swap) landed
• PR wip on exact swap #2366 merged V6 OrderBook bindings into main, which v5 inherited, causing v5.raindex.finance to generate calldata for withdraw4/deposit4/addOrder4 (IOrderBookV6) while deployed contracts only implement withdraw3/deposit3/addOrder3 (IOrderBookV5)
• Submodule gitlinks correctly set to V5 commits (lib/rain.orderbook.interface → dae86d795, lib/rain.interpreter → 18827b5af, lib/rain.tofu.erc20-decimals → ca8e8bacf)

Test plan

• Vault withdrawals call withdraw3 on v5.raindex.finance
• Vault deposits call deposit3
• Add order calls addOrder3
• CI passes (forge build, cargo build, wasm tests)

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[findolor]

Closing this in favor of a clean-history reset plan.

We created a new branch, v5-reset-base, from commit a044f50f (NPM Package Release v0.0.1-alpha.201), which is the last known good V5 state before the V5/V6 mix-up.

Plan from here:

• We will merge the 4 follow-up PRs onto v5-reset-base.
• Once that branch contains the exact V5-only fixes we want, we will move v5 to that final tip.
• That final step will be done with a --force-with-lease push so v5 matches the clean branch history exactly.

Because of that, we are not merging this PR. This PR was useful to validate the rollback target and confirm the affected surface area, but the actual recovery path is to rebuild from the clean base branch rather than merge a revert commit onto v5.