test(daemon): expand src/core unit coverage

[sudhirverma]

Summary

• Expand CoreState unit tests (builder API, credentials, list/chat/health paths) in packages/daemon/src/core/state.test.ts
• Expand engines.ts coverage for registry accessors, fetchModels provider paths, and streamChat error/stream mapping
• Add config helper and MemorySecretStore tests in existing core test files

Coverage impact (src/core):

• Overall: 56% → 83% statements
• state.ts: 14% → 80%
• engines.ts: 42% → 71%
• config.ts: 72% → 94%

Commits

• test(daemon): expand src/core unit coverage for CoreState, engines, and config — adds/extends core unit tests without new duplicate test files

Test plan

• npx vitest run src/core — 307 passed
• npm run lint -w packages/daemon
• npm test (full workspace)
• npm run ci:build

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 63.70%. Comparing base (9d26eb2) to head (68af5df).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #108      +/-   ##
==========================================
+ Coverage   60.12%   63.70%   +3.57%     
==========================================
  Files          37       37              
  Lines        4973     4973              
  Branches     1568     1568              
==========================================
+ Hits         2990     3168     +178     
+ Misses       1462     1262     -200     
- Partials      521      543      +22     

Flag	Coverage Δ
daemon	63.70% <ø> (+3.57%)	⬆️

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