valkyrjaio / valkyrja-java / 27854202448

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[Tests] One dedicated test file per code-bearing class (#26)

# Description

Every code-bearing class now has its own dedicated test covering 100% of
its file, mirroring PHP's per-class layout. The suite stands at 1210
tests across 382 files with JaCoCo holding at 99.83% (5716/5726) — the
only uncovered lines are the 10 provably-unreachable ones documented in
`architecture/java/TODO.md`.

Grouped test files (exceptions, param collections, typed responses,
typed headers, formatters, formats, messages, outputs, option
parameters) were split into one `<Class>Test` file per class and the
originals removed. Abstract-base coverage that previously lived in
grouped tests was relocated into the appropriate per-class test so
nothing regressed.

Pure interfaces (146) and annotation markers (21) have no bytecode for
JaCoCo to measure and are deferred; the TODO records that
structural/contract tests for those remain to fully mirror PHP's layout.

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## Types of Changes

- [x] Improvement _(non-breaking change which improves code)_
- [ ] Bug fix _(non-breaking change which fixes an issue)_
- [ ] New feature _(non-breaking change which adds functionality)_
- [ ] Deprecation _(breaking change which removes functionality)_
- [ ] Breaking change _(fix or feature that would cause existing
functionality to change)_
- [ ] Documentation improvement

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## Changes

- **`.github/ci/junit/src/test/java/io/valkyrja/**`** — added dedicated
`<Class>Test` files for all 201 previously-grouped/untested code-bearing
classes (each covering 100% of its file); removed the now-redundant
grouped tests (`ConcreteParamCollectionsTest`, `TypedResponsesTest`,
`TypedHeadersTest`, `FormatterVariantsTest`, `MessageVariantsTest`,
`OutputVariantsTest`, `OptionParameterSubclassesTest`, and the
per-module `*ExceptionTests`)
- **`ParamCollectionTest`** — absorbed the abstract-base `get()`
coverage from the deleted `ConcreteParamCollectionsTest`
- **`architecture/java/TODO.md`** — recorded comple... (continued)

1462 of 1610 branches covered (90.81%)

Branch coverage included in aggregate %.

5716 of 5726 relevant lines covered (99.83%)

4.34 hits per line