chore: point fixed-spread v4 at oracle.t0trade.com

[Siddharth2207]

Summary

• Update st0x-fixed-spread-v4.rain oracle-url from https://st0x-oracle-server.fly.dev/context/v4 to https://oracle.t0trade.com
• Update oracle-signer across all v4 scenarios to 0xE2f3e6aBde8D4dF23256B250Ae98dEe760C7ec84
• Bump strategy/registry pins (including settings.yaml) to the latest strategy commit

Test plan

• Confirm Raindex loads the updated strategy from the registry pin
• Deploy a base-st0x-baseline-v4 order and verify quotes come from oracle.t0trade.com
• Spot-check that signed context validates against the new oracle signer

[coderabbitai]

📝 Walkthrough

Walkthrough

The v4 fixed-spread strategy now uses https://oracle.t0trade.com, and all registry resource URLs are repinned to commit 903c63145b6217e387ad1440a0ed39f3a9be26d3.

Changes

Strategy resource refresh

Layer / File(s)	Summary
Update v4 oracle endpoint strategy/st0x-fixed-spread-v4.rain	The v4 oracle URL changes to https://oracle.t0trade.com.
Repin strategy registry resources strategy/registry	Registry references for settings and strategy files change to commit 903c63145b6217e387ad1440a0ed39f3a9be26d3.

Estimated code review effort: 1 (Trivial) | ~5 minutes

Possibly related PRs

• ST0x-Technology/st0x-oracle-server#35: Updates the v4 strategy’s oracle endpoint and related schema.
• ST0x-Technology/st0x-oracle-server#38: Repins registry resources and modifies the v4 strategy.
• ST0x-Technology/st0x-oracle-server#39: Repins registry URLs and changes the v4 strategy.

Suggested reviewers: hardyjosh

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly matches the main change: updating fixed-spread v4 to use oracle.t0trade.com.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/fixed-spread-v4-oracle-t0trade

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[Siddharth2207]

Superseded by #48, which includes the same v4 URL + signer cutover plus the full strategy URL migration.