chore(stdlib): deprecate cosmos::pay_fee ics-29

[traviolus]

Description

Closes: #XXXX

---

Author Checklist

All items are required. Please add a note to the item if the item is not applicable and
please add links to any relevant follow up issues.

I have...

• included the correct type prefix in the PR title, you can find examples of the prefixes below:
• confirmed ! in the type prefix if API or client breaking change
• targeted the correct branch
• provided a link to the relevant issue or specification
• reviewed "Files changed" and left comments if necessary
• included the necessary unit and integration tests
• updated the relevant documentation or specification, including comments for documenting Go code
• confirmed all CI checks have passed

Reviewers Checklist

All items are required. Please add a note if the item is not applicable and please add
your handle next to the items reviewed if you only reviewed selected items.

I have...

• confirmed the correct type prefix in the PR title
• confirmed all author checklist items have been addressed
• reviewed state machine logic, API design and naming, documentation is accurate, tests and test coverage

Summary by CodeRabbit

• Deprecations
  • The pay_fee function in the cosmos module has been marked as deprecated and will be removed in a future release. Users are encouraged to transition to alternative solutions.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 6a2def27-20cf-4663-96e7-5423b42e51bd

📥 Commits

Reviewing files that changed from the base of the PR and between ee3a70e and 075e05f.

📒 Files selected for processing (2)

• precompile/modules/initia_stdlib/sources/cosmos.move
• precompile/modules/minitia_stdlib/sources/cosmos.move

---

Walkthrough

The PR adds #[deprecated] annotations to the pay_fee entry function and its internal PayFeeRequest struct in both initia_stdlib and minitia_stdlib cosmos modules. Function signatures, parameters, and behavior remain unchanged.

Changes

Deprecate pay_fee IBC fee API

Layer / File(s)	Summary
Mark pay_fee and PayFeeRequest as deprecated precompile/modules/initia_stdlib/sources/cosmos.move, precompile/modules/minitia_stdlib/sources/cosmos.move	The PayFeeRequest struct and pay_fee public entry function receive #[deprecated] annotations in both cosmos modules. No function logic, request/response structures, parameters, or call patterns change.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

🐰 Fee functions rest in twilight's glow,
Deprecated paths bid us farewell.
New ways await, both swift and low,
Time for change breaks the API spell!

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title directly and specifically describes the main change: deprecating the cosmos::pay_fee function per ICS-29 specification.
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.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/deprecate-pay-fee

---

_{Comment @coderabbitai help to get the list of available commands and usage tips.}