chore: bump lib/rain.orderbook to quote-counterparty-msg-sender

[hardyjosh]

Caution

Chained to rainlanguage/raindex#2550 (itself chained to #2547) and #78. Merge order: raindex#2547 → raindex#2550 → this → st0x.rest.api#78. Submodule pointer rebased onto main of each dependency before merging.

Motivation

The parent PR #78 introduced the gating SignedContextInjector but gated orders still never got picked by the API — they were silently filtered at quote time. Root cause: orderbook.quote2 via Multicall3 set msg.sender = Multicall3, so the strategy's :ensure(equal-to(signed-context<0 0>() order-counterparty())) always reverted during quoting. Fixed in rainlanguage/raindex#2550 by switching the quote RPC to orderbook-native multicall(bytes[]) (delegatecall — preserves msg.sender) with from=counterparty.

Solution

Submodule bump only. The API already threaded counterparty through get_order_quotes_batch_with_injector via the injector; with the upstream fix in place, it now actually arrives at quote2 as msg.sender, gated orders simulate correctly, and the API returns takeOrders4 calldata that targets our gated orders.

Checks

By submitting this for review, I'm confirming I've done the following:

• added comprehensive test coverage for any changes in logic
• made this PR as small as possible
• linked any relevant issues or PRs
• included screenshots (if this involves a change to a front-end/dashboard)

Summary by CodeRabbit

• Chores
  • Updated orderbook module to the latest version.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

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Configuration used: defaults

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Run ID: 3e549728-faa6-4fcd-ab1c-000bef2f5d69

📥 Commits

Reviewing files that changed from the base of the PR and between f7635f8 and 91b2d58.

📒 Files selected for processing (1)

• lib/rain.orderbook

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📝 Walkthrough

Walkthrough

This pull request updates the lib/rain.orderbook submodule reference to a newer commit hash. The change consists of a single submodule pointer update with no modifications to the repository's own code, logic, or interfaces.

Changes

Cohort / File(s)	Summary
Submodule Update lib/rain.orderbook	Updated submodule commit reference from 6894f14... to 4dfef89...

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Possibly related PRs

• Bump rain.orderbook submodule to a0ad1955b #55: Updates the same lib/rain.orderbook submodule reference to align versions across repositories.

Suggested reviewers

• 0xgleb

Poem

🐰 A submodule hops to new ground,
Fresh commits in the orderbook found,
Version bumped with care so bright,
Rain.orderbook now updated right! 📚✨

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately reflects the main change: a submodule bump of lib/rain.orderbook to a specific commit referenced by the branch name 'quote-counterparty-msg-sender'.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch 2026-04-15-api-quote-counterparty

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[hardyjosh]

Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
Learn more

• chore: bump lib/rain.orderbook to quote-counterparty-msg-sender #79 👈 (View in Graphite)
• feat: API gating signer + signed context injection for take-orders #78
• main

This stack of pull requests is managed by Graphite. Learn more about stacking.

[hardyjosh]

@coderabbitai review

[coderabbitai]

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[hardyjosh]

Superseded by #78 — submodule bump folded into the gating PR.