fix: resolve 391 Credo issues across codebase
- Add jump_credo_checks ~> 0.4 with all 20 checks enabled
- Fix all standard Credo issues: 139 @spec (113 done, 26 remain),
4 refactoring, 3 alias usage, 9 System.cmd env, 5 unsafe_to_atom,
2 max line length, 9 assert_receive timeout
- Fix 170+ jump_credo_checks warnings:
- 117 TopLevelAliasImportRequire: move nested alias/import to module top
- 32 UseObanProWorker: switch to Oban.Pro.Worker
- 4 DoctestIExExamples: add doctests / create test file
- ~20 WeakAssertion: strengthen type-check assertions
- Various ConditionalAssertion, AssertReceiveTimeout fixes
- Exclude vendor/ from Credo analysis
- Remaining: 175 warnings (mostly opinionated WeakAssertion,
AvoidSocketAssignsInTest), 26 @spec annotations
Graham McIntire
fd976b0cd5