feat(key-wallet): expose instant_send_locks accessor on ManagedWalletInfo

[QuantumExplorer]

Summary

• Adds a read-only instant_send_locks() -> &HashSet<Txid> getter on ManagedWalletInfo.
• The underlying field is pub(crate) and #[serde(skip)]; this accessor lets external diagnostic surfaces (e.g. the iOS memory explorer) enumerate IS-locked txids without relaxing the mutation boundary.

Test plan

• cargo build -p key-wallet
• cargo test -p key-wallet
• Confirm consumer (iOS memory explorer) can list IS-locked txids via the new accessor

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: b889462a-aaf3-49cc-9af5-f8e169d86652

📥 Commits

Reviewing files that changed from the base of the PR and between ca507a9 and e3ea5cc.

📒 Files selected for processing (1)

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

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch expose-instant-send-locks-accessor

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[codecov]

Codecov Report

❌ Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 70.57%. Comparing base (ca507a9) to head (e3ea5cc).
⚠️ Report is 1 commits behind head on v0.42-dev.

Files with missing lines	Patch %	Lines
key-wallet/src/wallet/managed_wallet_info/mod.rs	0.00%	3 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##           v0.42-dev     #712      +/-   ##
=============================================
- Coverage      70.58%   70.57%   -0.01%     
=============================================
  Files            320      320              
  Lines          68243    68246       +3     
=============================================
- Hits           48168    48164       -4     
- Misses         20075    20082       +7     

Flag	Coverage Δ
core	75.81% <ø> (ø)
ffi	43.37% <ø> (ø)
rpc	20.00% <ø> (ø)
spv	87.22% <ø> (-0.03%)	⬇️
wallet	69.62% <0.00%> (-0.02%)	⬇️

Files with missing lines	Coverage Δ
key-wallet/src/wallet/managed_wallet_info/mod.rs	70.00% <0.00%> (-3.69%)	⬇️

... and 3 files with indirect coverage changes