chore(key-wallet): drop FeeEstimator

[ZocoLini]

This FeeEstimator doesn't really estimate any fee and is not being used anyware

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

Configuration used: defaults

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 0bc6592 and 607a9ac.

📒 Files selected for processing (2)

• key-wallet-manager/src/lib.rs
• key-wallet/src/wallet/managed_wallet_info/fee.rs

💤 Files with no reviewable changes (1)

• key-wallet/src/wallet/managed_wallet_info/fee.rs

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📝 Walkthrough

Walkthrough

This PR removes the public FeeEstimator type and all associated fee estimation logic from the key-wallet crate, including its methods and tests. The FeeRate export path is updated to a direct module reference, while FeeRate, FeeLevel, and transaction sizing functionality remain unchanged.

Changes

Cohort / File(s)	Summary
Export Updates key-wallet-manager/src/lib.rs	Removed public export of FeeEstimator; updated FeeRate export path from aggregate fee module re-export to direct module path.
Fee Estimator Removal key-wallet/src/wallet/managed_wallet_info/fee.rs	Removed entire FeeEstimator type, all associated methods (new, update_estimates, estimate_fee, estimate_fee_level, clamp_fee_rate, set_min_fee_rate, set_max_fee_rate), Default implementation, and related tests. FeeRate, FeeLevel, and transaction sizing logic remain intact.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

Poem

🐰 A simplification hops along the way,
Removing estimators that had their day,
FeeRate stands tall, clear and bright,
The API grows lean, the exports just 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 describes the main change: removal of the FeeEstimator type from the key-wallet crate.
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 docstrings (stacked PR)
• 📝 Generate docstrings (commit on current branch)

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch chore/drop-fee-estimatir

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