Migrate Keeper tests to simple testing with improved coverage

[masih]

Refine Keeper and tests to cover gaps in testing, and remove superfluous use of testify suit. Nowhere else in the codebase this suit of tests are used.

Add extra tests to cover gaps in coverage and concurrency control.

[github-actions]

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Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	✅ passed	✅ passed	✅ passed	May 22, 2026, 4:53 PM

[codecov]

Codecov Report

❌ Patch coverage is 92.85714% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 59.11%. Comparing base (67f1c97) to head (d0efbc0).

Files with missing lines	Patch %	Lines
sei-cosmos/x/capability/keeper/keeper.go	92.85%	1 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3497      +/-   ##
==========================================
- Coverage   59.12%   59.11%   -0.01%     
==========================================
  Files        2187     2187              
  Lines      182240   182190      -50     
==========================================
- Hits       107747   107703      -44     
- Misses      64835    64840       +5     
+ Partials     9658     9647      -11     

Flag	Coverage Δ
sei-chain-pr	93.58% <92.85%> (?)
sei-db	70.41% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
sei-cosmos/x/capability/keeper/keeper.go	93.58% <92.85%> (+7.19%)	⬆️

... and 25 files with indirect coverage changes

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[cursor]

PR Summary

Medium Risk
Touches core capability pointer/lookup behavior by switching capMap to a sync.Map with canonical per-index interning, which could affect authentication/claim semantics if any edge case is missed. Large test refactor and added coverage reduce risk but the keeper logic change is runtime-critical.

Overview
Stabilizes in-memory capability identity and improves safety under caching/concurrency. The keeper now uses a sync.Map plus internCapability to ensure a single canonical *Capability per index is reused across NewCapability, GetCapability, ClaimCapability, and genesis initialization, avoiding stale/mismatched pointers and removing the need to delete entries on release.

Reworks and expands tests. Migrates keeper_test.go off testify/suite to plain testing + require, runs tests in parallel with per-test setup, and adds new cases covering seal/scoping panics, scope isolation, cached-store revert/branch behavior, InitializeIndex, InitMemStore idempotency, LookupModules error paths, and keeper-level GetOwners/SetOwners + final-release cleanup.

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